It can be very useful to understand.Etiquette is very important idea to understand.不定式做什么成这个问题我问了很多人啦,她们的答案都不太理想,请高手指定迷津.

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It can be very useful to understand.Etiquette is very important idea to understand.不定式做什么成这个问题我问了很多人啦,她们的答案都不太理想,请高手指定迷津.

It can be very useful to understand.Etiquette is very important idea to understand.不定式做什么成这个问题我问了很多人啦,她们的答案都不太理想,请高手指定迷津.
It can be very useful to understand.Etiquette is very important idea to understand.不定式做什么成
这个问题我问了很多人啦,她们的答案都不太理想,请高手指定迷津.

It can be very useful to understand.Etiquette is very important idea to understand.不定式做什么成这个问题我问了很多人啦,她们的答案都不太理想,请高手指定迷津.
It can be very useful to understand.Etiquette is very important idea to understand
第一个句子中的to understand做主语,it是形式主语.
第二个句子中的to understand做补足语.

love is just a sense between two people. It can not be mesured by money. But it is also very practical,you must spend a long time to feel

第一个是作形式主语,第二个是做idea的后置定语