I learned some sign languages before为什么要在learned 前+had?直接那么说

I learned some sign languages before为什么要在learned 前+had?直接那么说也对吧?
I learned some sign languages before这样主为宾形式应该对啊!
必须的么?加个HAD 是什么结构了?

hitsrx 1年前已收到2个回答举报

弹出空白花朵

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两个句子都对.
加上had,就构成了过去完成式,表示“在过去某个时间点之前我早就学过了手语”.不加had表示“我以前学过手语”,意思上稍微有点差别.

1年前

就不乖幼苗

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加上had是过去完成时
不加是一般过去时
表示的时间不一样

1年前

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你能帮帮他们吗

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