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do i need to exercise two hours every day?exercise for two h

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do i need to exercise two hours every day?exercise for two hours行吗?表示一段时间为什么没用for呢
do i need to exercise two hours every day?exercise for two h
for 是用在表示从过去的某个时间段开始,一直到句中所指的时间发生的一件时.
It has been raining for two hours. 意思是于从两个小时前一直到现在一直在下.
Do I need to exercise two hours every day? 其中的 excercise 并没有在现在发生,只是在问需不需要.
do i need to exercise two hours every day?exercise for two h Need I to do exercise two hours every day?还是Do I need toexer ____I____exercise two hours every day.(do),(need) I do my homework for two hours every day . I am made to do my homework for two hours every day怎么变成主动语态 They exercise two hours a day.(对划线部分提问) _______ ________ do they exercise two hours a week.对two提问 （）（）（）do they exercise How _______ do you exercise?I exercise for an hour every day I do my homework (for two hours)every day.对括号内的提问 I use about two hours to do my homework every day.改为同意句. I use about two hours to do my homework every day.(同义句) I watch TV ( )two hours every day.A.in B.at C.for D.to