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否定句
I have not worked.
He/She has not worked.
They have not worked.
肯定句
I have worked.
He/She has worked.
They have worked.
haven’t
hasn’t
haven’t
现在完成时的结构：
has/have + done (动词过去分词)
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Has done sth.?
she / he / it / 或sb.的单数形式
Have done sth.?
I / we / you / they / 或sb.的复数形式
现在完成时的一般疑问句形式是：
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我父母曾经坐船去大连旅游。
她已经完成作业。
我父母未曾坐船去过大连旅游。
My parents have travelled to Dalian by ship.
She has finished her homework.
My parents haven’t travelled to Dalian by ship.
Make a sentense
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她还没有完成作业。