`3.`Lan isn't strong enough to swim across the river.

`4.`Our team is good enough to win the football match very often.

`5.`They aren’t tall enough to play basketball.

`6.`The radio isn’t small enough to put in the pocket.

`7.`He is clever enough so he does everything without any help.

`=>`Cấu trúc :

+) S + be + Adj enough + to V : đủ... đề làm gì...

+) S + be + not + Adj enough + to V : không đủ ...để làm gì...

#MHT
3. Lan isn’t strong. She can’t swim across the river. Lan isn’t strong enough to swim across the river. 
Giải thích: Ta có công thức  S + be (not) + adj + enough + to V
4. Our team is very good so our team wins the soccer match very often. Our team is good enough to win the football match very often.
Vẫn áp dụng công thức trên.
5. They are short. They don’t play basketball. They aren’t tall enough to play basketball.
6. The radio is big. It can’t be put in your pocket. The radio isn’t small enough to put in the pocket.
7. He is very clever. He does everything without any help. He is clever enough so he does everything without any help.

Chúc bạn học tốt, xin hay nhất ạ!