present and past tense verbs exercises

... Trang 2Present TensePresent Continuous Tense Present Perfect Tense Present Perfect Continuous Tense Past Tense Past Continuous Tense Past Perfect Tense Irregular Verbs - LIST Past Participles ... N 16 Trang 19Past Tenseand Present Perfect Both describe past actions. 1. Past Tense - He broke the vase. Present Perfect Tense - He has broken the vase. 2 It describes from the past until now ... - She must have been sore. Trang 18Past Tense: I walked.Past Continuous Tense: I was walking. 1. This morning, I was cleaning the kitchen. 2 The Past Simple Tense is used: An action is completed.

Ngày tải lên: 29/09/2022, 17:36

... Accounting Standards• Cost Accounting Standards Board - government contracts, colleges and universities that receive federal research funds • Governmental Accounting Standards Board - state and local ... Trang 1CHAPTER 1ACCOUNTING PRESENT AND PAST Trang 2-Learning Objectives1 What is the FASB? 2 Who uses accounting information and why? 3 What is accounting? 4 What do accountants ... over 140 standards statements • Uses due process is setting standards McGraw­Hill/Irwin ©The McGraw­Hill Companies, Inc., 2002 Trang 15Learning Objective 6• Where did accounting standards come

Ngày tải lên: 21/09/2020, 14:21

... Trang 7Present Perfect Tensehave/ has + past participle Have you ever seen a white deer? for, since, ever, never, already, yet, just, so far, recently Trang 8Present Perfect Continuous Tensehave/ ... Trang 10Past Continuous Tensewas/were + verb + -ING Alex is such a whiner –he was complaining about his boss for half an hour when we last talked For, while Trang 11Past Perfect Tensehad + past ... Trang 5Present Simple Tenseverb/ verb + -s/-es Do /Does … infinitive ? Do you enjoy working as a teacher? always, every day/month…, usually, often, sometimes Trang 6Present Continuous Tenseam/are/is

Ngày tải lên: 17/10/2020, 18:27

... "to be" in present tense or past tense Example: My dog (be) is sick today (present tense) Example: My dog (be) was sick last night (past tense) 1) The clouds moved away, and the sun shone ... correct form of "to be" in present tense or past tense Example: My dog (be) is sick (present tense) Example: My dog (be) was sick last night (past tense) 1) Sarah (be) at the party ... my best last night Li-Ning and Akmoud (be) friend She and | (be) in there too the same English class It meets from 10:00 to 10:50 3) Mallika and | (be) at 4) Johan and | (be) in the

Ngày tải lên: 03/01/2021, 09:43

... which are the present participle and the past participle (Mc Graw-Hill, 1976) According to Richards and others, the present participle is formed by adding -ing to a verb base The present participle ... collection procedure and the statistical analysis of data Chapter III presents the findings on the grammar test and the student interviews and applications for the teaching and learning English ... Adjectives is worth discussing Why do the students find it difficult to acquire the uses and meaning of present and past participles as adjectives A lot of reasons for this are assumed In my opinion,

Ngày tải lên: 28/03/2015, 09:23

... method of changing a sentence from active into passive in present simple tense and past simple tense easier and to improve the subject’s quality and to help students gain the basic knowledge to continue ... passive sentence exercises effectively, I have studied how to change an active sentence into a passive sentence in the present simple and the past simple and easy to remember and understand This makes ... THE OBJECT AND SCOPE OF THE STUDY: + The object of the research subject is the the method of changing an active sentence into a passive sentence in present simple tense and past simple tense used

Ngày tải lên: 14/08/2017, 08:27

... FOCUS ON: modals and present perfect passive phrasal verbs In Section 43, we discussed the use of several modal and semimodal auxiliaries in the present perfect These same modals and semimodals ... contraction 've, been, and the past participle: could + have + been + past participle would + have + been + past participle should + have + been + past participle have to + have + been + past participle ... have + been + past participle might + have + been + past participle may + have + been + past participle Let's compare a present perfect active sentence containing a modal with a present perfect

Ngày tải lên: 01/11/2013, 12:20

... each other) and just the physical state is changed Otherwise, the abstract view of the new computational state is computed and send to the neighbours, and both the computational and the physical ... modelling framework presented in the previous section In order to do so, meaning must be given to the sets and operations collected in Fig 2 and Fig 3 This will provide a succinct presentation of ... network and drain the energy resources, if minimal changes to the states uncritically are broadcasted • The model is not biased towards a particular energy harvester and it is not biased towards and

Ngày tải lên: 19/06/2014, 08:20

... Young’s modulus of the cantilever material; w, h and l are the width, thickness and length of the cantilever, respectively m is the inertial mass and m c is the mass of the cantilever The resonant ... direct mechanical force (Leland and Wright, 2006) The energy harvester consisted of a double clamped beam with a mass in the centre The tuning force was compressive and was applied using a micrometer ... capacitive and inductive loads The tuning range is between 57.4 and 66.5Hz However, output power varied with changes of electrical loads 2.5 Vibration energy harvesters with wide bandwidth The

Ngày tải lên: 19/06/2014, 08:20

... and tested for human body motion is presented and discussed the advantages of this structure Finally we will present a prototype of optimized cantilever micro generator which has been built and ... M.; Andò, B.; Baglio, S and Trigona, C (2009) Improved Energy Harvesting from Wideband Vibrations by Nonlinear Piezoelectric Converters, Proceedings of Eurosensors XXIII, Lausanne, Switzerland, ... prototypes will provide the depth understanding of the readers what level of voltage and power could be harvested from the macro and micro level EM energy harvester and whether micro or macro device

Ngày tải lên: 19/06/2014, 08:20

... Analysis (FEA) in order to understand the spring forces which exist between the fixed and moving magnets and to understand the flux linkage with the coil Figures 39 (a) and (b) show the results of ... Hz) and air compressor unit were measured in different positions of the machines for the VIBES project [5], [33] Figure 35, 36 and 37 show the vibration spectrum of an industrial fan and top and ... the available acceleration and frequency level of the different home appliance, machinery and automotive sources In the following section, we present such a generator and measure the power generated

Ngày tải lên: 19/06/2014, 08:20

... relating to the thermal domain and represent heat powers Q c at the cold side (15), and Q h at the hot one (16), while the last one comes from the electrical domain and represents an electrical circuit ... connected electrically in series and thermally in parallel They are sandwiched between two ceramic plates which are well conducting heat but on the other hand representing high electrical resistance ... sources, can be expressed by (9) In (10) and (11), boundary conditions for interfaces between heat source and Al2O3 as well as Al2O3 and copper strips are presented 2 2 0 d T 0 Al O Al O x 2 3 2

Ngày tải lên: 19/06/2014, 08:20

... C(e), which represents the capacity (or bandwidth) of the link, and Trang 6variable E(v, e), which represents the energy required at node v to process (receive or generate)a data packet and to forward ... time-varying power, bandwidth, and resource constraints 2 Network model and workload sustainability Any WSN can be modeled as a directed graph with vertices associated with network nodes and edges associated ... algorithms for autonomous WSNs Section 2 presents the network model used for analyzing workload sustainability under energy, bandwidth and resource constraints, and introduces the concept of maximum

Ngày tải lên: 19/06/2014, 08:20

... system and the market is huge demanding for such distributed sensing of human well beings through their vital signs However, the present state of arts and commercial products are limited and there ... devices are still receiving huge attentions and commercial demands simply because of their outstanding features, but they really need to be highly portable and easily embeddable into our bodies for ... products like blood pressure meter, thermometer and portable ECG and Philips vital sense product and sports monitoring devices as seen in Figures.1 and 2 For these commercially available health

Ngày tải lên: 19/06/2014, 08:20

... automobiles and aeroplanes and structures such as buildings and bridges Also human and Trang 3animal bodies are considered interesting sites for vibration harvesting As an example in Fig 2 we present ... Represents the energy stored x  Represents the dissipative force ( , ) Represents the reaction force due to the transduction mechanism z  Represents the vibration force The quantity z represents ... mass and is usually expressed as the sum of its kinetic and potential energy: when the spring is completely extended (or compressed), the mass is at rest and all the dynamic energy is represented

Ngày tải lên: 19/06/2014, 08:20

... fabricating and characterising free-standing thick-film piezoelectric cantilevers for energy harvesting Firstly the research requires the understanding of the process conditions and limitation ... E k, δ ij , and σ kl can be describe in a strain-charge form of constitutive equation as, Vector i (C/m2) and E k (N/C) are tensors of three components and the stress σ kl (N/m2) and the strain ... ceramics like barium titanium, and lead zirconate titanate, PZT, and polymer piezoelectric materials like polyvinylidene fluoride, PVDF and polyimide can be manufactured and easily integrated with

Ngày tải lên: 19/06/2014, 08:20

... example calculation and plot for the estimated received power level, assuming 0dBi transmitter (BTS) and receiver antenna gains and free space propagation loss (FSPL) for FM and DTV is presented in ... generation and marine corrosion and fouling of underwater structures were discussed It is suggested that the proposed technology could be realized and optimized with adequate scientific and technological ... sources Section 2.2 presents the antenna design for RF EH in the cellular band as well as DTV band The key issue in RF energy harvesting is the RF-to-DC conversion efficiency and is discussed in

Ngày tải lên: 19/06/2014, 08:20

... 1Open Access Review The fields of HIV and disability: past, present and future Jill Hanass-Hancock*1 and Stephanie A Nixon2 Address: 1 Health Economics and HIV/AIDS Research Division (HEARD), ... HIV and sex education for youth with disabil-ities; 2 Expanding research on disability and HIV, particu-larly in the context of sexual and reproductive health and gender-based violence; and 3 ... national HIV and AIDS policies and pro-grammes; and equal access for persons with disabilities in Africa to information and services on HIV and AIDS [70] At its second meeting, held in Uganda in 2008,

Ngày tải lên: 20/06/2014, 08:20

... Trang 1REVIEW: Simple present and simple continuous tense © Copyright: Thudominh Grammar Trang 206/26/24 Nguyễn Mạnh Hùng 2• Ở xác định ... can the Trang 11Make these sentences into questions1 I’ m late Am I late? 2 Mr and Mrs Jones are at home. Are Mr and Mrs Jones at home? 3 Jane lives near here. Does Jane live here? 4 She’s from ... occasionally Trang 9Complete the gap with are you or do youWork in pair with a person from other group Ask and answer the questions do you Do you do you Do you do you Do you Are you do you Do you are you

Ngày tải lên: 27/06/2014, 18:20

... building, animating, and changing ascene SandScape and Illuminating Clay [115] are TUIs for designingand understanding landscapes (Figure 4.4) The users can alter the co-Fig 4.4 The Sandscape [115] ... connection blink and move their ears Edge andBlackwell [51] suggest that tangible objects can drift between focus andperiphery of a user’s attention and present an example of peripheral(and thus ambient) ... field We then presentTUIs in a broader context, survey application domains, and reviewframeworks and taxonomies We also discuss conceptual foundations Trang 5and philosophy Methods and technologies

Ngày tải lên: 29/06/2014, 17:20