Put your coat on也可以写成put on your coat为什么有的不能分开,比如说look forWe can say'i am looking for my pen',but we cannot say 'I am looking my pen for'.Why?

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Put your coat on也可以写成put on your coat为什么有的不能分开,比如说look forWe can say'i am looking for my pen',but we cannot say 'I am looking my pen for'.Why?

Put your coat on也可以写成put on your coat为什么有的不能分开,比如说look forWe can say'i am looking for my pen',but we cannot say 'I am looking my pen for'.Why?
Put your coat on也可以写成put on your coat为什么有的不能分开,比如说look for
We can say'i am looking for my pen',but we cannot say 'I am looking my pen for'.Why?

Put your coat on也可以写成put on your coat为什么有的不能分开,比如说look forWe can say'i am looking for my pen',but we cannot say 'I am looking my pen for'.Why?
put on是动词加副词短语,可以分开.
look for是动词加介词短语,不可分开,是固定词组.

look for sth 是一个固定短语,所以不能拆开look for, put on sth 不同, 有put it on这样的说法,具体的可以看看语法书

for有很多意思
i am looking for my pen 意思是我在找我的笔
look for 是一个短语,意思是寻找
不能分开