小升初英语语法专项培优突破 第11章：现在完成时（4）过去完成时与现在完成时的比较

这是一份小升初英语语法专项培优突破 第11章：现在完成时（4）过去完成时与现在完成时的比较，共2页。
I had knwn him when I was a student.
我当学生时，就已经认识他了。
过去完成时与现在完成时二者用法基本相同，但现在完成时以现在的时间为基点，过去完成时则以过去的时间为基点，与现在无关，即过去的过去。
I have finished my experiment.
我已经做完实验了。
(表示现在说话时已经做完实验)
By six 'clck，I had finished my experiment.
在六点以前，我就已经做完实验了。
(表示在过去的某一时间six 'clck以前已经做完实验，与现在毫无关系)
注意
过去完成时，主要用于间接引语中。
必背！
易混词组
Hw lng多久…… Hw ften多久一次 Hw far多远……
(只指时间，不指距离) (指频率) (指距离)
Hw sn Hw many times
(指多长时间) (指次数)
过去完成时与现在完成时的比较 练习题
按要求变换句型
1．Is Tm's bike new?(肯定回答)

2．There are cme English bks in the desk.(一般疑问句)

3．He has tea at half past tw in the afternn.(否定句)

4．It will take the wrkers mre than a mnth t repair the bridge.
(对划线部分提问)

5．I did my hmewrk by myself yesterday.(一般疑问句)

6．He had dne with the gds befre he went away.(否定句)

7．The teacher was talking with Tm's mther.(对划线部分提问)

8．I'm allwed t watch TV at hme nly nce a week. (对划线部分提问)

【答案】
1．Yes, it is．
2．Are there any English bks in the desk?
3．He desn't have tea at half past tw in the afternn．
4．Hw lng will it take the wrkers t repair the bridge?
5．Did yu d yur hmewrk by yurself yesterday?
6．He hadn't dne with the gds befre he went away．
7．Whse mther was the teacher talking with?
8．Hw ften are yu allwed t watch TV at hme?