李　敏

do和does被評(píng)為單詞界的“活雷鋒”!頒獎(jiǎng)詞是：“因?yàn)樗麄z用作助動(dòng)詞時(shí)，本身并沒(méi)有實(shí)在的意義，但卻熱心地幫助實(shí)義動(dòng)詞構(gòu)成一般疑問(wèn)句和否定句?！钡拇_如此，你瞧：

He has an English book——Does he havean English book? (一般疑問(wèn)句)

Mary plays football every afternoon.——Mary doesn't play football every afternoon.(否定句)

看到了吧，含有實(shí)義動(dòng)詞的句子在變一般疑問(wèn)句和否定句時(shí)，不能直接在動(dòng)詞上變，而是要靠do和does的幫助：當(dāng)d0和does站在句首時(shí)，句子就變成了一般疑問(wèn)句：當(dāng)(do和does的否定形式dont和doesnt站在謂語(yǔ)動(dòng)詞前時(shí)，句子就變成了否定句。

注意：這兩種句子中的實(shí)義動(dòng)詞要變成原形。do和does有明確的分工：does只管主語(yǔ)是第三人稱單數(shù)(he，she，it或單數(shù)名詞)的句子；其余的一律歸do管。用所給動(dòng)詞的適當(dāng)形式填空：

1. He________(live) in Wuxi two years ago.

2. The cat___________(eat) a bird last night.

3. We__________(have) a party last Halloween.

4. Nancy____________(pick) up oranges on the farm last week.

5. I____________(make) a model ship with Mike yesterday.

6. They______________(play) chess in the classroom last PE lesson.

7. My mother_____________(cook) a nice food last Spring Festival.

8. The girls____________(sing) and____________(dance) at the party.