1.Sweden is colder than vietnam.->

C1:Vietnam is not as cold as Sweden.

C2:Vietnam is hotter than Sweden.

2.Dalat is quieter than Saigon.

-> Saigon is not as quiet as Dalat

Saigon is noisier than dalat.

3.The town has many motorbikes.

-> There are many motorbikes in the town

4.Trains are slower than planes.

-> Planes are faster than trains.

5.The air in the countryside is often cleaner than the air in the city.

->The air in the city is more pollution than the air in the countryside

The air in the city is not as clean as the air in the countryside

6.Does your neighbourhood have a theatre?

->Is there a theatre in your neighbourhood ?

Viet Nam is not as cold as Sweden.

 The Andes is the longest mountain ranges in the world.

A car is often more expensive than a motorbike.

Ho Chi Minh City is not as quiet as Hoi An.

Ba Be Lake is the biggest natural lakes in Viet Nam.

Children should go to bed early.

Linh' s house is in front of the garden.

There are more than 1000 students in my school.

Does your school has a computer room ?

You must do your homework.

Could you show me the way to get to the City's Exhibition, please ?

You should brush your teeth after meals.