YOU SAID:

This jit is so stupid she dont know how to act.

INTO JAPANESE

このjitはとても愚かで、彼女は行動する方法を知らない。

BACK INTO ENGLISH

This jit is so stupid and she doesn't know how to act.

INTO JAPANESE

このjitはとても愚かで、彼女は行動する方法を知りません。

BACK INTO ENGLISH

This jit is so stupid and she doesn't know how to act.