题目内容
19．I think he will come here if he has free time．（改为否定句）Idon't think hewill come here if he has free time．
分析 我认为如果他有空他会来这里．
我认为如果他有空他不会来这里．
解答 答案：don't，will．这里是think后加宾语从句，主语是第一人称，故将否定转移到主句，主语I，是一般现在时，故借助于do构成否定，故答案是don't，will．
点评 动词think，believe，suppose，imagine，expect，feel的主语是第一人称、谓语动词为没有任何副词修饰的一般现在时，它们的否定式实际上是对宾语从句或复合符合宾语或状语的否定．表示说话者提出一种委婉的看法或主张，即将not从宾语从句的谓语动词的前面，转移到了主句谓语动词think，believe，suppose等的前面．即（否定前移）
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