I have to rewrite the sentences and to use the correct form of:_need to; have to and 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.It is 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 flowers.
9.We should have bought that house.
10.If you want to get there by ten, it's necessary to leave at nine.
so I have to rewrite those examples I'm waiting from you.
You have to do the re-writing - someone can then advise you. We do not do your work for you.