致学生 v
致老师 v
Thanks vi
练习序号 页码
1–10 现在进行时与一般现在时 2
(I am doing and I do)
11–17 一般过去时与过去进行时 7
(I did and I was doing)
18–22 现在时与过去时 11
(I do / I am doing and I did / I was doing)
23–28 现在完成时 / 现在完成进行时 14
(I have done and I have been doing)
29–30 现在完成时 / 现在完成进行时与一般过去时 18
(I have done and I have been doing; I did)
31–34 现在完成时 / 现在完成进行时与现在时 19
(I have done / I have been doing and I do / I am doing)
35–36 现在完成时 / 现在完成进行时、现在时与一般过去时 22
(I have done / I have been doing， I do / I am doing and I did)
37–42 现在完成时 / 现在完成进行时与一般过去时 23
(I have done / I have been doing and I did)
43–46 一般过去时、过去进行时与过去完成时 / 过去完成进行时 27
(I did， I was doing and I had done / I had been doing)
................
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