状语从句练习he did not buy the book ,beacuse it was too expensive.为什么在这里过去时还用buy ,而不用bought

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状语从句练习he did not buy the book ,beacuse it was too expensive.为什么在这里过去时还用buy ,而不用bought

状语从句练习he did not buy the book ,beacuse it was too expensive.为什么在这里过去时还用buy ,而不用bought
状语从句练习
he did not buy the book ,beacuse it was too expensive.
为什么在这里过去时还用buy ,而不用bought

状语从句练习he did not buy the book ,beacuse it was too expensive.为什么在这里过去时还用buy ,而不用bought
buy是实义动词,其否定形式要用助动词 do not(过去时时用did not),其人称和时态的变化都在助动词do oot上,而不需要改变buy.

前面疑问词是did
后面的动词要用原型

这个是一般过去时的否定句啊……
did not 后面要跟动词原形

did not 过去式的否定形式后加动词原形呀

did not 后面是动词原形啊

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