题目内容
19.Wehave known (know) each other since we were at school.分析 我们自从上学就相互认识.
解答 答案是have known.本题考查语境中选用恰当的动词时态.since往往与现在完成时连用,如果since后接从句,从句中用过去时,主句中用现在完成时;题干中since从句动词用了过去式were,主句动词know应该用现在完成时,故答案是have known.
点评 本题是要求用所给动词的适当形式填空,解题时首先考虑句中需要的是谓语动词还是非谓语动词;其次,如果是谓语动词关注时态、语态和数的变化;如果是非谓语动词要联系非谓语的基本用法判断非谓语的形式.
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