объясните пожалуйста как написать открытку и когда мы ставим on а когда for

the garden.

3.The girl is trying on dress

4.nick s talking with his friends.

5.The students re reading.

6. The man is sitting in the armchair .

7. The girl is reading,

8.The woman is wearing a blue dress

9.Peter,s brother is riding a biysycle.

10. They are talking about the film

11. He is speaking over the telephone

12. The boy is running fast because it is raining

НУЖНО СРОЧНО !!! Заранее спасибо))