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非谓语动词问题8When you were talking to the policeman,I saw a teena

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非谓语动词问题8
When you were talking to the policeman,I saw a teenager____.
答案是get on your car and drive off,为什么不是got on your car and drove off呢?
好,请先这么看.如果是你所想的,连起来就是这样:I saw a teenager got on your car and drove off.那么请分析语法,这个分句中有两个谓语动词.按主谓宾的基本格式,可能吗?显然不可以.所以后面的动词必须成非谓语动词,作为宾补.那么一般是改成~ing形式或者加to成动词不定式.这里强调动作所以用后者,就是to get.由于see等动词后的不定式习惯省掉to,所以就成了你看见的get了.