YOU SAID:

I must brush my teeth, before reading a book, and then later exercising.

INTO JAPANESE

私は本を​​読んでから、後で運動をする前に歯を磨かなければなりません。

BACK INTO ENGLISH

Not brush your teeth before you exercise after I read the book.

INTO JAPANESE

寝る前に歯を磨きなさい。

BACK INTO ENGLISH

Brush your teeth before going to bed.

INTO JAPANESE

寝る前に歯を磨きなさい。

BACK INTO ENGLISH

Brush your teeth before going to bed.