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基本结构
have / has + done
助动词 （可以帮助构成肯定、疑问和否定句）
1.He has cleaned his room.
(写一个一般疑问句）
Has he cleaned his room?
2. She has lived in London
for four years. (划线部分提问）
How long has she lived in London?
3. He has been to China, ____ ____?
（写出反义疑问句部分）
hasn’t he
4. They have come back from work.
(写否定句）
They haven’t come back from work.
What are the key words for the Present Perfect Tense?
A: ______ your brother ______ his homework yet? (finish)
B: Yes, he ‘s already done it.
Key words
Has finished
yet
already
注意：already 用于肯定句，
yet 用于疑问句和否定句中
A: _______ you ever _______ to the park? ( be )
B: No, never.
Key words
Have been
yet
already