rewrite 1 they last went to school two weeks ago they haven't 2 hoa was sick , so she could not go to school because 3 my mother enjoys tea very much tea is my 4 i think that learning frech is difficult i find it

=>

1. They haven't gone to school for two weeks.

 S + HTHT (phủ định) + since / for + …..
->  S + last + QKĐ (khẳng định) …+

2.  Because Mary was sick, she couldn't go to school.

3. Tea is my mother's favorite drink.

4. I find it difficult to learn French.

( S + find + ( somebody / something ) + adj + to V)