题目内容
7.Johnson won't answer the phone if he ___________ the number.( )| A. | knew | B. | doesn't know | C. | will know | D. | didn't know |
分析 如果约翰逊不知道号码就不会接我电话.
解答 答案:B.if引导的是条件状语从句,遵循主将从现的规则,结合前后文这里是表达不知道号码就不会接我电话,从句主语he故借助于助动词does构成否定,故答案是B.
点评 含有be动词,情态动词或者助动词have/has的句子转化成否定时在其后面加上not,一般实意动词的否定式,通常应根据不同时态和人称在实意动词之前加don't,doesn't,didn't等.
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