Make the sentences negative.close your book!

Don't close your book или Do not close your book!

Don't sit on the grass. It's wet.What have you got in your pocket? «Is the bank near here?» «Yes, turn right at the traffic lights». Look! There's a child on the roof. What's he doing?There are a lot of fish in this river.I usually do my shopping at the city centre.There's somebody………our door.Bill is working in the garden.Mike is working on the table.

Vegetarians are people who don't eatmeat.
Look out! My wife is coming
I play tennis every week.
Who sits in my chair?
He stay with John for a few weeks until his flat's ready.   
What are you doing with my coat?
I sleep on Niko's sofa until I find a place of my own.
If you aren't listening to the radio, why don't you switch it off?
I is against my principles is against my principles. 

Are you leving party now?  Present continiuos
Do you love him? Present simple
Have you ( or have you got )  brothers or sisters? Present Simple
Who cooks dinner tonight а здесь допустимо и Present Simple, и Present Continiuos, англ язык, к сожалению, богат на такие двойственности Who is cooking dinner tonight?
Does he send you an e-mail every day? Проверьте свой текст если send, то так, как я указала выше. Если sent, то Did he send you an e-mail every day? На 4 предложении настаиваю на варианте Who is cooking dinner tonight?