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1.I_____(see)them dancing under that tree for a long time.答案

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1.I_____(see)them dancing under that tree for a long time.答案为saw,请问have seen行不行?
2.The best way to improve English is _____(talk) foreigners.talk ,但是否不能用 talking?
3.What if she_____(not come) tomorrow?应填doesn’t come 还是 won't come?
4.They thought that kids couldn't do the things like students,_____.
是填either还是too?
xiexie!
1.不能 ,see sb doing sth 表示动作正在发生(此句中表示过去看时正在跳舞)
2.可以.非谓语动词作真正的主语.你可以改成:To talk with foreigners/Talking with foreigners is the best way to improve English .
3.doesn't come 在有if的条件状语从句中用一般现在时表示将要发生.
4.either 句子表否定时用either 肯定时用too .