all we can do is to 为什么能用两个动词 is 跟 do

all we can do is to 为什么能用两个动词 is 跟 do all we can do is to 为什么能用两个动词 Be后怎么跟动词原形 All we have to do is clean or peel it 请问这个句子中all I have to do is learn english.is跟learn不是都是动词吗?为什么 请问All you do now is to complete the form .中的 do 为什么是动词原形 All I can do is My idea is ____(that,which)we can do without them.为什么不能用whic what can we do when there is nothing to do? All that we can do is wait 英语语法问题 all we can do to help him is that give him some money 英语翻译---I guess all we can do is to stay at home and watch TV I guess all we can do is to stay home and watch TV.句中all 可换成