must translate English to Spanish: Cambridge Dictionary
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Translation of "must" - English-Spanish dictionary

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must

verb /mast/ ( negative short form mustn’t /-snt/)
used with another verb to express need
deber, tener que
We must go to the shops to get milk.
used, usually with another verb, to suggest a probability
deber
They must be finding it very difficult to live in such a small house.
used, usually with another verb, to express duty, an order, rule etc
deber
You must come home before midnight All competitors must be under 15 years of age.
must have used to state a probability about something in the past
deber haberse
She must have been very young when she got married.
(Definition of must from the Password English-Spanish Dictionary © 2013 K Dictionaries Ltd)
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