一、表时间,可以和时间状语从句互换。如: Studying in the university, he was very popular among his classmates.= When he studied in the university, he was very popular among his classmates. Seeing those pictures, she remembered her childhood. = When s...
A. while B. before C. after D. since 解析:考核状语从句连词。根据句意,表示在我问他们姓名之前,他们离开了,因此答案选择B 25. My book, The House of Hades, is missing. Who ___ have taken it? A. need B. must C. should D. could 解析:考核情态动词。句意表示...
since引导时间状语从句通常以肯定的形式与主句的“现在完成时”连用,但其所表示的含义却有肯定与否定两种:1.当since从句的谓语是终止性动词时,表示肯定含义,意为“自从……以来”,例如:It is three years since she began to smoke. (她抽烟已经3年了);2.当since从句...
考试重点:一般现在时(if 从句和as soon as 从句);进行时表将来;现在完成时和现在完成进行时的区别;完成时瞬间动词以及have (has) been, have (has) gone的区别;过去完成时的时间状语;将来完成时。 一、一般现在式 1、表示经常发生的动作或存在的状态:常和always, usua...
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