如果你讲述的是过去的事情,句子里面有情态动词must /can / may等（表达猜测时）,你的动词时态应该是:情态动词+完成式（have + 过去分词）.如：
He was here last week,I am sure.------------ He must have been here last week.
She didn't come yesterday,I think.--------- He couldn't have come yesterday.
SAT语法题求助!To stand in Persepolis in modern Iran and look out,
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