動詞第三人稱單數形式講解
1、什麼是第三人稱單數？
人稱可分為三類：第一人稱、第二人稱和第三人稱
第一人稱： I we
第二人稱： you
第三人稱： he、she、it、they和人名 稱謂類（如：Peter、Jane、my father等）
結合以上知識，第三人稱單數就是he、she、it、人名、稱謂。
2、動詞為什麼要變成相應的三單形式？
在一般現在時中，跟在第三人稱單數後面的動詞也要變成相應的三單形式，例如：
I watch TV every day. 如果主語是三單，動詞要變化：
--He watches TV every day.
She watches TV every day.
Jane watches TV every day.
3、動詞三單的變化規則
1、一般情況下直接加s，如speak-speaks, like-likes, play-plays
2、以s, x, sh, ch, o 結尾的加es，如 wash-washes, go-goes, do-does, watch-watches
3、以輔音字母+y 結尾的，改y 為i 再加es，如 study-studies，try-tries
4、特殊變化，如 have-has
4、does和doesn’t 在句子中的用法
否定句：主語+don’t/doesn’t+動詞原形+（其他）。如：
I don’t watch TV. 我不看電視。
當主語為第三人稱單數時，要用doesn’t 構成否定句。如：
He doesn’t watch TV. 他不看電視。
注意doesn’t後面用動詞原形watch，而不是watches
一般疑問句：Do / Does+主語+動詞原形+（其他）。如：
Do you watch TV?
Yes, I do. / No, I don’t.
Does he watch TV?
Yes,he does./No,I doesn't.
練習題：
1. He often ________(have) dinner at home.
2. Daniel and Tommy _______(be) in Class One.
3. We _______(not watch) TV on Monday.
4. Nick _______(not go) to the zoo on Sunday.
5. ______ they ________(like) the World Cup?
6. What _______they often _______(do) on Saturdays?
7. _______ your parents _______(read) newspapers every day?
8. The girl _______(teach) us English on Sundays.
9. She and I ________(take) a walk together every evening.
10. There ________(be) some water in the bottle.
（參考答案1.has 2.are 3.don't 4.doesn't go 5.Do like 6.do,do 7.Do,read 8.teaches 9.take 10.is ）
11. Mike _______(like) cooking.
12. They _______(have) the same hobby.
13. My aunt _______(look) after her baby carefully.
14. You always _______(do) your homework well.
15. I _______(be) ill. I’m staying in bed.
16. She _______(go) to school from Monday to Friday.
17. Liu Tao _______(do) not like PE.
18. The child often _______(watch) TV in the evening.
19. Su Hai and Su Yang _______(have) eight lessons this term.
20. －What day _______(be) it today? － It’s Saturday.
(參考答案11.likes 12.have 13.looks 14.do 15.am 16.goes 17.doesn't 18.watches 19.have 20.is )
注意：在做題過程當中，先看主語，之後判斷動詞的變化哦！