Ну ! третий раз ! умоляю! составить предложения (короткие) с местоимениями: mine yours hers his its, myself yourself herself himself itself.

this pen is mine
that book are yours
it is hers toy
i will doing this work myself
she did that work herself
he had done his homework himself
 

This pen is mine, than pen is yours.

This toy is hers, that toy is his.

I don't need your help and I'll do it myself.

It's your hometalk so do it yourself.

She did her homework herself.

He cooked dinner himself.

The cat isn't itself today.