... Schrampfer Understanding and using English grammar / Betty Schrampfer Azar - - 3rd ed. p. cm. Includes index. ISBNO-13-958661-X 1. English language—Textbooks for foreign speakers. 2. English language Grammar Problems, ... studying for two hours. Event in progress: studying. When? Before now, up to now, How long? For two hours. PAST PERFECT PROGRESSIVE 2 hrs.' (b) Tom had been studying for two hours before his ... Kay's location, i.e., on where Kay is. *In formal English, a subject pronoun follows than: He's older than I (am). In everyday informal English, an object pronoun is frequently used after...
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