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定义
2.表示从过去的某一时间开始，一直持续到现在的动作或状态，可能还将持续下去。
He has lived here for ten years.
we have learned English since 2013.
She has kept the book since 5 days ago.
肯定式：主语+have/has+动词的过去分词+其它
否定式：主语+have/has +not+动词的过去分词+其它
疑问式： Have/Has+主语+动词的过去分词+其它
:have/has+动词的过去分词
I have had the camera for three years.
She hasn’t watered the plant yet.
Have you ever been to Canada ?
Already 往往用于肯定句，用在疑问句时表示强调或加强语气；yet用于否定句或疑问句。
He has already left here.（肯定句）
Has he already left here? (加强语气)
My teacher haven’t had breakfast yet.（否定句）
Have you written to your parents yet?（一般疑问句）
1.表示到说话时为止已经发生或完成了的动作或状态，强调对现在的影响或结果。
already, yet , ever, never, just, before, once, twice, so far.
Have you ____ watered the plants?
No, not ____ . I will do that in a minute.
A. already, already B. yet, yet C. already, yet D. yet , already
C
b. Never是否定词，表示“从来没有”，而ever表示“曾经”.
We have never been to the Great wall.
Have you ever been to Canada?
c. Just表示“刚刚”（用于完成时态，与already, never等副词的位置一样，多用于助动词have/has和动词过去分词之间）
He has just come back.
They have just finished the work.
2. 表示过去某个时间开始的动作，或存在的状态，一直持续到现在并可能还将持续下去。