(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用法: I didn't know about it until you told me. It was not until you told me that I knew about it.(强调句型) Not until you told me did I know about it. (not until放句首,主句要倒装) 直到你告诉我,我才知道这件事。 4.before和since (1)若表达“还未……就……;不到……就……;……才……;还没来得及……”时,需用连词before。before从句中谓语不用否定式。如: We had sailed four days and four nights before we saw land. 我们航行了4天4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。 Before they reached the station, the train had gone. 他们还没到车站,火车已开走了。 (2)It will be+一段时间+before...“多久之后才……。”如: It will be half a year before I come back. 还得待半年我才能回来。 It won't be long before we meet again. 过不了多久我们会再见面的。 (3)since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反复发生过的动作。since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: I have written home four times since I came here. 自从我来到这儿,我给家里写了四封信。 She has been working in this factory since she left school. 她离开学校以来,就一直在这个工厂工作。 (4)在“It is+一段时间+since从句”句型中,如果since从句中动词为延续性动词,时间的计算一律从since从句的动作完成或状态结束时算起。如: It is three years since the war broke out. 自战争爆发以来有三年了。 It is three years since I smoked a cigar (=since I stopped smoking a cigar). 我不吸烟有三年了。 如果译成“我吸烟有三年了”,应为:It is three years since I began to smoke. 5.every time, each time, next time, the first time, any time, all the time等名词短语用来引导时间状语从句,表示“每当……;每次……;下次……”等。如: *
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