Student or Learner
I read these two sentences in Hewings' ADVANCED GRAMMAR IN USE (2005 edition) unit 18:
I can't start the computer. You must have to know a password.
John wasn't at home when I went round. He must have had to go out unexpectedly.
This is the first time I've read sentences with 'must' used together with 'have to' and 'have had to'. I was surprised how these two modal verbs with the same meaning could be used side by side. Is it standard English?
Thank you very much.
This is the first time I'm seeing this use too. I don't think it's frequently used right?
Results 1 - 10 of about 1,730,000 English pages for "must have to".
Results 1 - 10 of about 53,700,000 English pages for "have to".
I'd guess that such 100% assumptions make life easier. Besides, in laypeople's conversational English most would probably disregard the implication of "must".