摘要：非延续性动词的完成时和it is +时间+since-.. 英语中有些动词不能延续. 因此不能和表示延续的时间状语连用. (1)He has the army for ten years and is now an officer. A. gone into B. joined in C. been in D. come into (答案:C.用现在完成时表示“继续 的概念时.只能用含有持续意义的动词.不可用瞬间性动词.) (2)It is 3 years since I left Shanghai .我离开上海已经三年了. (如果是非延续动词.这时常用 it is +时间+since 的句型代替.从句用过去时态.)
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用括号内动词的正确形式填空(现在完成时和一般过去时)
I was very tired, so I ________(lie)down on the bed and ________(go)to sleep．