The moment I heard the voice, I knew father was coming. 我一听到声音,就知道父亲来了。 No sooner had we arrived at the station than the train left. 我们一到车站,火车就走了。 The boy burst into tears immediately he saw his mother. 一看到他的母亲,男孩突然大哭。 注意:no sooner...than;hardly/scarcely...when...这一结构的时态搭配:no sooner与hardly/scarcely引导的主句谓语动词应用过去完成时,而than与when的从句中谓语动词应用一般过去时。此外,当把no sooner和hardly/scarcely提到句首时,应用倒装程序。如: I had hardly got home when it began to rain. =Hardly had I got home when it began to rain. 我一到家,就开始下雨了。 3.till, until和not...until (1)肯定句:主句谓语动词必须是延续性动词,主句、从句都为肯定式,意为“某动作一直延续到某点时间才停止”。如: He remained there until she arrived. 他一直留到她来。 You may stay here until the rain stops. 你可以在这里呆到雨停。 (2)否定句:主句谓语动词必须是非延续性动词,从句为肯定式,意为“某动作直到某时间才开始”。 如:He won't go to bed till (until) she returns. 直到她回来,他才睡。 (3)till不可以置于句首,而until可以。如: Until you told me I had no idea of it. 直到你告诉我,我才知道这件事。
(4)not...until 句型中的强调和倒装说法 It was not until you told me that I had any idea of it.(强调句型) Not until you tole me did I have any idea of it.(not until 置于句首主句要倒装) 4.before和since 若表达“还未……就……”“不到……就……”“……才……”“趁还没来得及”时,需用连词before。 如:We had sailed four days and four nights before we saw land. 我们航行了四天四夜才看到陆地。 We hadn't run a mile before he felt tired. 我们跑了还不到一英里他就累了。 Please write it down before you forget it. 趁你现在没忘把它记下来。 Before I could get in a word, he had measured me. 我还没来得及插话他就给我量好了尺寸。 before从句中谓语不用否定式,又如: Before they reached the station, the train had gone. 他们(还没)到火车站前,火车已开走了。 (1)It will be +一段时间+before从句 “多久之后才……” It will be half a year before I come back. 半年后我就会回来。 It won't be long before we meet again. 不久我们会再相见的。 从句的谓语动词一般是非延续性动词,主句的谓语动词是延续性的或者是反复发生过的动作。从句的时态若是一般过去时,相应地,主句中的时态是现在完成时或现在完成进行时。如:
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