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(1)“本句用了It be＋一段时间＋since从句”句式。 ①本句式常用于两种时态： 句型公式：It’s been...since... ②在本句式中，since从句中的谓语动词为短暂性动词时，意为“某人做某事已经有多久了”；若从句中的谓语动词用延续性动词时，则意为“某人不做某事已经有多久了”。 (2)It was/will be＋time＋before...过了/要过多长时间才…… It is/was＋时间点＋when...做某事是在某具体的时间 It is/was＋时间状语＋that...是在什么时间做的某事 (1)It has been 3 years since I published my first book. 自从我出版第一本书以来已经三年了。 (2)Tom told me it was 5 years since he had moved to Canada. 汤姆告诉我自从他移居加拿大以来已有五年了。 (3)It was two weeks before he recovered. 他过了两周才恢复过来。 (before引导时间状语从句) (4)It was six o’clock when we got home last night. 昨天晚上我们到家时已经6点了。(when引导时间状语从句) (5)It was at six o’clock that we got home last night. 昨天晚上我们是在6点钟到家的。(强调句型) (1)单句语法填空 It has been six years he smoked. (2)完成句子 ①It is/has been three years . 他当医生三年了。 ②It won’t be long . 过不了多久我们就会再见面的。 ③It was eleven last night. 昨天晚上我回到家时已经十一点了。 多维训练 since since he became a doctor before we meet again when I came home 答案 | 
