英语十六种时态的基本形式.

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英语十六种时态的基本形式.

英语十六种时态的基本形式.
英语十六种时态的基本形式.

英语十六种时态的基本形式.
一般时态 进行时态 完成时态 完成进行时态
现在 do/does am/is/are doing have/has done have/has been doing
过去 did was/were doing had done had been doing
将来 shall/will do shall/will be doing shall/will have done shall/will have been doing
过去将来 should/would do should/would be doing should/would have done should/would have been doing