Công thức: too...to.. (quá ... đến nỗi không)

S + be + too + ADJ + (for O) + to V 

Công thức enough....to... (đủ..để làm gì)

S + be + ADJ + enough + (for O) + to V 

S + V + ADV + enough + (for O) + to V 

S + be/V + enough + N + (for O) + to V 

--------------------------------------

S + be + so + ADJ + that + clause 

S + be + such + (a/an) + ADJ + N + that + clause 

--------------------------------------

11. 

- They are such big cows that they five us a lot of milk.

- The cows are big enough for them to five us a lot of milk.

- The cows are so big that they give us a lot of milk.

12.

- He speaks too slowly for his students to get very bored.

- He speaks so slowly that his students get very bored.

- He doesn't speak quickly enough for his students to get very bored.

13.

- It is such a boring book that nobody likes it.

- The book is not interesting enough to like it.

`color{orange}{~LeAiFuRuiHuiBao~}`