Then make sentences. We use this/these/that/those in the singular and this/these/that/those in the plural. We use this/these/that/those in the singular and this/these/that/those in the plural

We use this in the singular and these in the plural. We use that in the singular and those in the plural.

This is a pen. - These are pens.

This is a flower. - These are flowers.

This is a window. - These are windows.

This is a dog. - These are dogs.

This is a cat. - These are cats.

This is a rat. - These are rats.

This is a green tree. - These are green trees.

This is a high building. - These are high buildings.

That is a mouse. - Those are mice.

That is a yellow leaf. - Those are yellow leaves.

That is a good singer. - Those are good singers.