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1、10. since 句型： It is/ has been +时间段+ since+一般过去时. (到目前为止）干某事有多长时间了 It was + 时间段 + since +过去完成时 （到过去某时间为止）干某事有多长时间了 Sb/ sth.+ 现在完成时+since+ 过去时。 。 （ 注意从句的谓语动词是否延续） Eg: It is about ten days since he came back from abroad. It was days since I had left there. 比较一下： He has written to me frequently since I
2、fell ill. 自从我生病以来，他就经常给我写信。 He has written to me frequently since I was ill. 自从我病愈以来，他经常给我写信。 11. when 句型： It will be +时间 + when +一般现在时 当某事发生时，时间将会是。 。 。 It was +时间 + when+一般过去时 当某事发生时， 时间是。 。 Eg: It will be midnight when they get there . It was 1949 when new China was founded. 13、强调句型： (1) It is wa
3、s 被强调部分that（who） 例：It was I who wrote to my uncle yesterday是我昨天给我叔叔写信的。 (2) Is/was it + 被强调部分 + that (who) . 例：Was it your brother that you met in the street?在街上你遇见的是你兄弟吗？ (3) Where/who/what/how + is/was it that . 例：How is it that you will go to visit her tomorrow?明天你究竟怎样去看望她？ 宾语从句中的强调句 Tell me who
4、it was that you met in the street yesterday afternoon? (4) do +谓语动词（强调谓语） 例：They do know the place well. 他们的确很熟悉那个地方。 (5) not until 的强调句型：It + be not until that 14、用于表示过去未实现的希望和计划的句型： (1) should like to/ would like to/ would love to have done sth. 例：You should like to have written to your mother.你本应
5、当给你母亲写信。 (2) expect, intend, hope, mean, plan, promise, suppose, think, want, wish 常用过去完成时态,在这些词后接宾语从句或者接不定式的一般形式； 或者用一般过去时态后面接不定式的完成形式 例：I had wanted to helped you with your homework but I couldnt spare any time.=I wanted to have helped .(3) wish that had done sth.表示过去未曾实现的愿望 例：I wish he had been here yesterday. 要是他昨天在这儿就好了。 (4) 情态动词 should ,would, could, might, ought to 等后接不定式的完成时，表示 should have done =ought to have done 本应该做而没做 would have done = 本来就会去做某事而没做 could have done = 本可以做某事而没做 might have done 本可以做而没做 例：They ought to have apologized. 他们本该道歉的。
