>>> 网上你可以找到很多的带有must have to的句子
>> Can you give some examples?
> http://corpus.byu.edu/bnc/x.asp :
> He must have to have about half a dozen though, mustn't he?
> So you must have to get one from somewhere then?
> A place of that size must contain thousands; and must have to feed thousands.
> He was so dark that he must have to shave two or three times a day, ...
> Presumably they must have to pay for all the preparation leading up to an operation of this sort, ...
Thank you. That byu corpus site is interesting. I did a little more search on Google. There *are* some people out there that say "must have to", I guess to emphasize the point, as if either "must" or "have to" alone is not strong enough. Next time I talk to my coworker or neighbor, let me say that and see how he (she) responds!