一般现在时:He comes from American.
Does he come from American?
yes, he does. No, he doesn't.
Where does he come from?
一般过去时:He came from American.
Did he come from American?
yes, he did. No, he didn't.
Where did he come from?
一般将来时: He will go to Beijing tomorrow.
Will he go to Beijing tomorrow?
Yes, he will. No, he won't.
where will he go?
现在进行时: He is swimming.
Is he swimming?
Yes, he is. No, he isn't
What is he doing ?
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