Hi, i searched this forum before posting, and there are quite some threads as to the use of 'must', 'should' and 'have to' but none that really tells me what i'd like to know. I don't understand this explanation from michael swan's practical english usage. Be to + infinitive = going to = must ( as the text says, be to + infitive adds demand,destiny or expectation, also necessity or obligation) i am to buy this car tomorrow.
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Needs must is listed in the oed with many reputable examples.
The book says have to can also be used to talk about obligation coming from the speaker or.
Does anybody know the question tag of the next sentence:When talking about internal obligation, we can use either must or have to. There is a separate entry for needs must where it relates to the devil driving.There is no suggestion of a.
One of the uses of 'would' has been listed below:I sent you a message the other day that might. You use 'would', or 'would have' with a past participle, to indicate that you are assuming or guessing that something is true,.But when talking about external obligation, we only use have to and not.




