1.The weather is so bad that we can’t go out. (too) 
The weather is too bad for us to go out.
2. The film was so boring that we couldn’t go on seeing it. (too)
->The film was too boring for us to go on seeing it.
3. You speak so fast that I can’t catch up with your words. (too)
-> You speak too fast for me to catch up with your words.
4. He studied so badly that he couldn’t pass the exam. (too)
->He studied too badly for him to pass...
5. My sister is so weak. she can’t run. (too)
-> My sister is too weak to run.
6. The coffee was very hot. They couldn’t drink it. (too)
-> Yhe coffee was too hot for them to drink it.
7. This table is not big enough for 10 people to sit. (too)
-> The table is too small for 10 people to sit.
8. The water is warm enough for you to have a bath. (too)
-> 
9. My parents allowed me to go sightseeing. (let)
->my parents let me go sightseeing. 

10. The CEO let me use his car for private purposes. (to use)
->