9. She is very old. She can't walk far.

=> She is too old to walk far.

10. The wall is so high. They don't climb over it.

=> The wall is too high for climb over.

11. She is too young to see that film.

=> She isn't old enough to see the horror film.

12. It was so cold that we don't go out.

=> It was too cold for us to go out.

13. This store is too small for us to take notice of.

=> This store isn't large enough for us to take notice of it.

14. These goods are too expensive to be sold quickly.

=> These goods are so expensive that they can't be sold quickly.

15. The ground was so hard that he couldn't dig it.

=> The ground was too hard for him to dig it.

*Giải thích:

Cấu trúc "so that" (quá... đến nỗi):

    S + be(chia) + so + adj + that + S + V

    S + V(chia) + so + adv + that + S + V

Cấu trúc với "too to" (quá để làm gì):

     S + to be + too + adj + (for somebody) + to + V

     S + V + too + adv + (for somebody) + to + V

Cấu trúc với "enough to" (đủ để có thể làm gì):

     S + V + adv + enough + (for somebody) + to + V

     S + to be + adj + enough + (for somebody) + to + V

Chúc bạn học tốt!