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?Yes, 主+have/has. No, 主+haven’t/hasn’t.
1. 规则动词：与过去时变化相同。
(1) 一般+-ed
work---worked---worked
(2) 以“ e ”结尾, + - d 。
live---lived ---lived
(3) “辅音字母 + y” 结尾，y 变 i, + -ed。
cry---cried---cried
(4) 重读闭音节结尾(辅元辅)，双写后+-ed 。
drop---dropped--dropped
2 、不规则动词，见不规则表（p120）
动词过去分词 (pp)变化规则
I have finished my homework.
I have not finished my homework.
Have you finished your homework?
Yes, I have./No, I haven’t.
She has been to Europe.
?She hasn’t been to Europe.
?Has she been to Europe?
?Yes, she has./No, she hasn’t.
A: ______ your brother _________ a new watch? (buy )
B: Not yet.
三、标志词
Has bought
yet
A: _______ you ever _______ to the park? ( be )
B: Yes, I have.
Have been
yet
ever