Составьте в отрицательной форме. и объясните . they work hard at the office. my friend plays chess well.

They don`t work hard at the office.
My friend doesn`t play chess well.

Present Simple Tense
отрицательная форма -I,we,they,you+ don`t+инфинитив без частицы to
he,she,it +doesn`t+инфинитив без частицы to