英语中如何鉴别to是介词还是不定式的连词？ 怎么辨别英语中TO是做介词还是不定式?
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to
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forward
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1）填原形，这就是不定式的 to.
例如：Our English teacher asked us to (write) a paper about our summer vacation.
不定式 to write 后面势必还有宾语跟着。
2）填动名词，动词+ing 的形式。
例如：It is faster taking the bus to school, compared to (walk).
这句就要填 walking ，to 是跟着compare 这动词后面的介词。
你必须对to 前面的动词用法非常熟悉，不然你判断不出来to 是介词还是不定式符号。有很多动词可直接跟不定式短语作宾语，如 want to do sth, need to do sth, like to do sth., 另外不定式短语常用作状语。We study hard to get better grades.
在有些动词短语中to 是介词，这些需要你重点记忆， 如 look forward to, compare to 后面跟名词或动名词。
如果是不定式的固定搭配，你就可以轻松填to do,如果不确定，就看前面的动词是否带了宾语，若带没有，就todo,若有：1，表目的—to do.2, n.|doing
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