Переделайте предложения,образуя формы множественного числа. there is a big fir-tree in the park. there is a good movie on tv today. there is a not a free seat in the hall. there is a train at 10: 30.

There are many big fir-trees in the park.
There are some good movies on TV today.
There are no free seats in the hall.
There are two trains at 10:30.