新概念英语2 第三课问题,but i did not understand a word (意思是一个字也不懂,那为什么

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新概念英语2 第三课问题,but i did not understand a word (意思是一个字也不懂,那为什么要加个did?）
原文是
Postcards always spoil my holidays.Last summer,I went to Italy.I visited museums and sat in public gardens.A friendly waiter taught me a few words of Italian.Then he lent me a book.I read a few lines,but I did not understand a word.Every day I thought about postcards.My holidays passed quickly,but I did not send cards to my friends.On the last day I made a big decision.I got up early and bought thirty-seven cards.I spent the whole day in my room,but I did not write a single card!

Then he lent me a book.I read a few lines,but I did not understand a word.
然后他给了我一本书,我读了几行,但是我一个字都不懂.
首先,这是叙述过去发生的事情.
时态都用的过去式.
I did not understand a word.
为什么要加did呢,因为否定的是understand这个词,而且是发生在过去的,不懂,而不是懂,所以要用did not.
问:i did understand a word 这样的话,did可以去掉吗?如果不去掉,起什么作用?
答:did可以去掉,understand要变understood.不去掉的话,did起语气强调作用,

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