2015届高考英语一轮复习教案：Module 1《Europe》（外研版必修三）_高考复习指南

　　这里buy是“非延续性”动词，不能和表示一段时间的状语连用，应换成have的过去分词。即：Mr. Smith has had many Chinese books ever since he came to China.

　　①It is/has been＋时间段＋since从句(过去时)

　　注意：since从句中的动词是非延续性动词，表示该动作开始有多久了，若since从句中的动词是延续性动词，则表示该动作终止有多久了。

　　主句现在完成时＋从句(过去时)

　　②It will be＋时间段＋before从句(一般现在时)

　　“要过多久才……”

　　It's two weeks since he joined the army.

　　他参军两周了。(非延续性动词)

　　我不住在这儿三个月了。(延续性动词)

　　It will not be long before he knows the truth.

　　过不了多久，他就会知道真相。

　　单项填空

　　④The first use of atomic weapons was in 1945, and their power

　　increased enormously ever since.

　　A．isB．wasC．has beenD．had been

　　【解析】　根据ever since (从那时，一直到现在)应用现在完成时。

　　【答案】　C

　　⑤

　　Bill this morning but I

　　him ever since.

　　A．have seen；haven't seen

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