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I have learned English for ten years.
We have visited your school before.
He has lost his key to his bike.
He has lived in London since ten years ago.
现在完成时的构成形式
肯定句：主语+have/has +过去分词
They have seen the film.
否定句：主语+have/has +not+过去分词
They have not seen the film.
一般疑问句：Have/Has+主语+过去分词
Have they seen the film?
1.He has cleaned his room.
(变一般疑问句和否定句）
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?
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