-I am very lucky because I have many good friends
I am lucky to have such many good friends
-The bag isn't light enough for the boy to cary
The bag is too dark for the boy to carry
Cấu trúc S+be+ too+ adj+ (for O)+ to V
-The book was so interesting that I read it twice
The book was interesting enough for me to read twice
-The garden is too small for us to play football in
The gaden is not big enough for us to play in
-He was so tired that he fell asleep before the end of the film.
He was too tired to fall asleep before the end of the film