Rewrite the sentences.use the correct form of need to,have to, or ought to. 1 you should get your hair cut 2 it wasn't necessary for us to go to the meeting 3 do you think it would be a good idea if i rang mark? 4 he's obliged to work every saturday 5 it would have been a good idea for you to ask paul 6 is it necessary for me to buy the tickets in advance? 7 were you obliged to wear a uniform at school? 8 it wasn't necessary for you to buy me flowers 9 we should have bought that house 10 if you want to get there by ten,it's necessary to leave at nine