A Past perfect tense 过去完成时态 We can use the past perfect tense to talk about an action that happened before another action in the past.
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a past perfect tense
过去完成时
以上为机器翻译结果，长、整句建议使用 人工翻译 。
So you learn the past tense and then two or three weeks later, oh now you are learning the present perfect, and then a few weeks later, you are learning the future, that's crazy.
你学习了过去时，然后两到三周后你开始学习现在完成时，几周以后你又开始学习将来时，这简直太疯狂了。
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