现在进行时与过去进行时的比较 现在进行时表示现在某个时候或某段时间正在进行的动作 I don't really work here. I ____ until the new secretary _______.

A. just help out; comes B. have just helped out; will come

C. am just helping out; comes D. will just help out; has come

说明：指目前一段时间正在发生的动作, until 引导的是时间状语从句,动词需用一般现在时。 过去进行时表示某个时候或某段时间正在进行的动作 - Hey, look where you are going!

- Oh, I'm terribly sorry. _______.

A. I'm not noticing. B. I wasn't noticing.

C. I haven't noticed. D. I don't notice.

说明：对话的后者显然是在解释刚才不小心冒犯对方时正在做的事情. 一般过去时与过去进行时的比较 一般过去时只表达过去的动作或状态 Tom________ into the house when no one ___________.

A. slipped; was noticing B. had slipped; noticed

C. slipped; had noticed D. was slipping; noticed

说明：slip和notice 为同时发生的动作，因此B、C为错误选项，slipped指过去有结果的动作（他溜进去了），when no one was noticing 指他溜进去的一刹那发生的情况（没有人注意）。 过去进行时表示某个时候或某段时间正在进行的动作 .He ______ a book about China last year, but I don't know if he ______ it.

A.wrote; has finished B. was writing; has finished

C. was writing; had finished D. wrote; will finish

说明：正确选项为B. 从I don't know if he has finished it.推断，他去年一直在写。 II. 动词的被动语态

常用被动语态 构 成 常用被动语态 构 成 1 一般现在时 am/is/are done 6 过去进行时 was/were being done 2 一般过去时 was/were done 7 现在完成时 have/has been done 3 一般将来时 shall/will be done 8 过去完成时 had been done 4 过去将来时 should/would be done 9 将来完成时 will/would have been done 5 现在进行时 am/is/are being done 10 含有情态动词的 can/must/may be done