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什么情况不定式短语后面需要加上介词?i don't have a partner to practice english with they have nothing to worry about?那什么情况需要加上后面的with ,about 呢

题目详情
什么情况不定式短语后面需要加上介词?
i don't have a partner to practice english with
they have nothing to worry about?
那什么情况需要加上后面的with ,about 呢
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答案和解析
这个的话= =比如说你举的例子,practice english with partner,worry about nothing 这些名词是跟在介词后的.
a pen to write with就是write with a pen 如果不加介词的话就变成write a pen