we don't often go to the library 为什么用 don't

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wedon''toftengotothelibrary为什么用don''twedon''toftengotothelibrary为什么用don''twedon''toftengotothelibrary为什么用

we don't often go to the library 为什么用 don't
we don't often go to the library 为什么用 don't

we don't often go to the library 为什么用 don't
often是副词,去掉不影响意思.所以主句是we go to the library,主语是we,所以加否定应该是don‘t

因为是否定额。然后we,they,I,you用do,其他是does.

因为该句已有谓语动词go 所以否定形式要用助动词do 由于主语是复数we 况且表示一个经常性的动作 所以用一般现在时 固用do的一般现在时复数形式