i couldn't study grammar very good 哪儿错了?

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icouldn''tstudygrammarverygood哪儿错了?icouldn''tstudygrammarverygood哪儿错了?icouldn''tstudygrammarverygood哪儿错

i couldn't study grammar very good 哪儿错了?
i couldn't study grammar very good 哪儿错了?

i couldn't study grammar very good 哪儿错了?
good ---->well
well 作副词 修饰动词study