Сделать отрицание и вопросы 1)there are twenty children in our class 2) she will start her work tomorrow 3) i am a pupil of the fifth from 4)they opened the window two hours ago 5) my friends are from great britain 6) he will travel to london with his friend

1) There aren't twenty children in our class. How many children are in our class? (Are there twenty children in our class?) 2) She won't start her work tomorrow. Will she start her work tomorrow? 3) I'm not a pupil of the fifth form. Are you a pupil of the fifth form? 4) They didn't open the window two hours ago. Did they open the window two hours ago? 5) My friends aren't from Great Britain. Where are my friends from? (Are my friends from Great Britain?) 6) He won't travel to London with his friends. Will he travel to London with his friends?