1. Let's play badminton

=> what about playing badminton.

2. Hoa is younger than Hong

=> Hong is not younger than hoa

3. what's your address?

=> where are your live?

4. he is strong.He can carry that suitcase

=> he is strong enough can carry that suitcase

5. Long is taller than Hung

=> Hung is shorter than Hung.

6. Let's go out tonight.

=> Why don't go out tonight

7. He can't lift all those suitcases because he's too weak.

=> He is not strongt  enough to lift those suitcases.

8. Minh drives carefully.

=>Minh is a careful driver

9. He studies well

⇒ He's a good students

$\text{1.}$ What about playing badminton?

$\text{→}$ What about + V-ing?

$\text{2.}$ Hong is not as young as Hoa.

$\text{→}$ S1 + be/ V + (more) + adj/ adv(-er) + than + S2 = S2 + be/ V(-) + as + adj/ adv + as + S1

$\text{3.}$ Where do you live?

$\text{→}$ What is one's adress? = Where do/ does + S + live?

$\text{4.}$ He is strong enough to carry that suitcase.

$\text{→}$ adj + enough (for sb) to-V

$\text{5.}$ Hung isn't as tall as Long.

$\text{6.}$ Why don't go out tonight?

$\text{→}$ Why not + V?

$\text{7.}$ He is not heavy enough to lift all those suitcases.

$\text{→}$ too + adj + (for sb) to-V = not + adj + enough + (for sb) to-V

$\text{8.}$ Minh is a careful driver.

$\text{→}$ S + V + adv = S + be + (a/ an) + adj + N

$\text{9.}$ He is a good student.