Помогите! Correcting mistakes(Исправить оплошности)In each of the following sentences there is

Помогите!

Correcting mistakes(Поправить оплошности)

In each of the following sentences there is one mistake. Find it and correct it.

a. How long you have been learning English?

b. She's living in Paris since 1987.

c. I broke the leg while I was skiing.

d. The cheque to John I gave on Saturday.

e. She thinks it's a good idea, but I'm not agree.

f. I was very frighten when I saw the film.

g. We had lovely weekend by the sea.

h. You'll like Kate a lot. She's very sympathetic.

i. Look at all those stares in the sky!

j. She asked to borrow my book, and I gave to her.