1.напишите предложения,употребив this или these:
a bus.
new cars.
big houses.
an ice-cream.

1) This is a bus.

2) These are new cars.

3) These are big houses.

4) This is an ice-cream.

This - для единственного числа

These - для множественного числа

this is a bus

these are new cars

these are big houses

this is an ice-cream

Объяснение:

this пишется при единственном числе

these при множественном