We use chalks to write things on the blackboard.

Đáp án của mk nè:

8. The weather is too cold for us to go out.

-> The weather is so cold that we can't go out.

-> The weather isn't too nice for us to go out.

9. This film isn't interesting for us to see

-> This film is too boring for us to see. 

Câu nào vậy???