1.I found Helen (singing) under the tree.

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1.I found Helen (singing) under the tree.
为什么不用was singing?前面不是过去式吗?
2.I'm afraid you (forgot) the date,didn't you?
这里为什么要用过去时?
3.Mr.black has lived in Beijing for (two and a half years).
and 后面是a half,为什么还要用years?还有,可以说“two years and a half year”吗?
4.-Did you go to Sam's weekend party?
--No,I( wasn't invited).
Did 提问为什么用wasn't 回答?

1.一句话里不能有两个谓语动词,singing是状语,表示Helen目前的状态.
2.因为这句话的句意是“我恐怕你忘记了日期吧”在说话人话一出口的瞬间,对方便一定已经想起来了,所以“忘记”是过去的事情用过去式.
3.“two years and a half year”这个恐怕不行……我从来没见过……至于这个用“years”的问题……两年半是单数还是复数啊?还是复数吧……
4.因为是表示过去没有被邀请,被动语态里只有was啊,所以只能用 wasn't invited来回答.

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