what____you____(buy) yesterday 这里如何填空?what____you____(buy) yesterday 我见有人填为what did you buy yesterday 这个句子是一般过去时,为啥后面的buy不改为bought?还是只是他回答错了?这个句子正确的应该为what did you bought yesterday?为啥是did buy呢？没弄明白…… 可以举几个例子吗?
问题描述：
what____you____(buy) yesterday 这里如何填空?
what____you____(buy) yesterday 我见有人填为what did you buy yesterday 这个句子是一般过去时,为啥后面的buy不改为bought?还是只是他回答错了?这个句子正确的应该为what did you bought yesterday?
为啥是did buy呢？没弄明白…… 可以举几个例子吗?
答
what did you buy yesterday ? did已经表现了过去时，所以bought应改为原型buy
答
did是助动词，本身就有过去事态，后面只能跟原形！
答
what__did__you__buy__(buy) yesterday
did已经体现了过去时,bought应改为原型buy
答
did buy