问几道动词填空题

题目

问几道动词填空题
I asked him which of the cities he______(be)to had the largest population.
Li Ming actually failed in this chemistry quiz,but he told his parents that he_________(get)a good grade.He____(not,tell)such a big lie.
Such exhausting work______(wear)him out.So he is lying on his back to have a rest.
I don't want to drink the milk any more because it________(taste)too sweet.
该填什么时态.为什么要填那些时态

答案

1 had been to 过去完成时 因为主句时态是过去时,也就是我提问的时间在过去,而他去那些城市的时间在我提问的时间之前,也就是从句的事件发生在过去的过去,所以用过去完成时.
2 got 主句时态是过去时,所填部分是宾语从句中的谓语部分,时态要与主句一致.所以用过去时
has't told 现在完成时 句意是:他从来没有说过这样大的谎话.所以用现在完成的否定
3 has worn 现在完成时 过去发生的事情对现在的事情还产生影响,所以用现在完成
4 tastes 一般现在时 因为taste是感官动词,主动表被动,所以不用被动语态.句意:我不想再喝那个牛奶了因为它尝起来太甜了.