He must have, he could have, he might have, he would have, etc. You should have received a confirmation email and you must have received a confirmation email. 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.
Meaning you should know this information. I know that mustn't have done is incorrect in british english. Hello everybody, i have read some information about this but i want to make it more clear.
How could i translate this sentence that must be it it´s said after giving some orders, so could it be así tiene que ser thanks Hi everybody :) could you please tell me how to express agreement and disagreement with sentences containing must and mustn´t? What is the difference between these two? Must is a modal verb, and all modal verbs are followed by a bare infinitive:
A bbc site says that must suggests that it is the speaker who has decided that something is necessary, whereas have to and have got to suggest that somebody. Like all modal verbs, must.