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一种现象的英文是“a phenomena”吗
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现在进行时和一般过去时 I have done/ I did
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现在完成进行时 I have been doing
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现在完成进行时和现在完成时 I have been doing/ I have done
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一般将来时 will, be going to
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将来进行时与将来完成时 will be doing / will have done
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should/ought to常见用法
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should/should have done
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