Question

语法正确吗 if you can learn a foreign language well reaching mother tougue ,that is ok

Answer 1

正确。

句子结构解析

主句：that is ok
条件状语从句：if you can learn a foreign language well reaching mother tougue 其中 ——
* 主语 -- you
* 谓语动词 -- can learn
* 宾语 -- a foreign language
* 现在分词充当的language的后置定语 -- well reaching mother tougue （意思是：完全达到母语的[外语]）

整个意思：如果你可以学到一门完全达到母语的外语，那就可以了。

Answer 2

if you can learn a foreign language better than the mother tougue， that is ok

Answer 3

语法完全正确 意思简单明了！