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

There are big fir-trees in the park.
There are good movies on TV today.
There are not free seats in the ball.
There are trains at 10.30