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简介：
I'm I am (我是)
she's she is (她是)
he's he is (他是)
it's is is (它是)
we're we are (我们是)
you're you are (你是/你们是)
they're they are (他们是)
that's that is (那是)
what's waht is (是什么)
who's who is (是谁)
where's where is (是在哪)
how's how is (是怎样)
isn't is not (不是)单数
aren't are not (不是)复数
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