一般现在时: I like math. I don't like math. Do you like math?
一般过去时: He got up late yesterday. He didn't get up late yesterday. Did he get up late yesterday?
现在进行时: She is doing her homework now. She isn't doing her homework now. Is she doing her homewor now?
过去进行时: She was doing her homework this time yesterday. She wasn't doing her homework this time yesterday. Was she doing her homework this time yesterday?
一般将来时: I will go to school tomorrow. I won't go to school tomorrow. Will you go to school tomorrow?
过去将来时: I said I would go to school next Monday. I didn't say I would go to school next Monday. Did you say you would go to school tomorrow?
现在完成时: I have finished my homework. I haven't finished my homework yet. Have you finished your homework?
过去完成时: We had learnt 1600 words by the end of last term. We hadn't learnt 1600 words by the end of last term. Had you learnt 1600 words by the end of last term?
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