Помогите пожалуйста, очень безотлагательно!!! Some of these sentences are right and

Помогите пожалуйста, очень безотлагательно!!!
Some of these sentences are right and some are wrong. Correct the sentences that are wrong. Write 'okay' if the sentence is right.

She's a very nice person. okay

I need a new jeans. I need a new pair of jeans / I need some new jeans

I've got two brother and four sister...

It's a lovely park with a lot of beautiful tree..

There are a lot of sheep in that field

Do you make many mistake when you speak English?.............................................

She's married and she has three childs.

Most of my friend are students.

He put on his pyjama and went to bed.