you have to be caeful with people you don not konw

You have to be out to be you have to be cruel to be i have you to be you have who to be I have you to be You have to be healthy to look o you have to pretend to be have you any thing to be Be nice to you,always have,always in this life you have to be You have to be happy everyday Have you ever________(be) to Science Museum. you don't have to be mean you have to be logged first sometimes you have to be cruel to be you don't have to be dirty to be you have to be willing to step up to the you have got to be与you have to be有什么语法上的区别?