<正> Ⅰ.have to v. must have to v.表示义务(obligation),往往着重于客观上的需要;而must则着重于主观上认为有义务、有必要。如: It is going to rain.If you insist on going out,you’ll have to bringan umbrella。 Have you(got)to go to the office today? We must study hard。We must be there in time。