这个单词怎么不是过去式?He lent me a book,I read a few lines ,but I did not understand a word.这句话中的understand 怎么不是understood?

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这个单词怎么不是过去式?He lent me a book,I read a few lines ,but I did not understand a word.这句话中的understand 怎么不是understood?
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这个单词怎么不是过去式?He lent me a book,I read a few lines ,but I did not understand a word.这句话中的understand 怎么不是understood?
这个单词怎么不是过去式?
He lent me a book,I read a few lines ,but I did not understand a word.这句话中的understand 怎么不是understood?

这个单词怎么不是过去式?He lent me a book,I read a few lines ,but I did not understand a word.这句话中的understand 怎么不是understood?
Did后面加动词原型

都did了还会understood吗?
你该不会以为 I do not understand所以
did 就是understood吧??????????
你有在学吗???????

您好!
因为句子中已经用了did not,did not 后面加动词原形。