*là

-She is a doctor.

-This is a dog.

-He is my brother.

-Is that your pen?

-My name is An.

*thì

-He is tall.

-My mother is cooking.

-I am riding a bike.

-My hair is brown.

-She is thin.

*ở

-I am at home.

-She is at the hospital.

-He is at the supermarket.

-It is on the tree.

-Her mother is on the kitchent.

CHÚC BẠN HỌC TỐT!!