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You are watching: What part of speech is must

First of all, allow me give you these example sentences:

there is a stormthere was a stormthere has actually been a stormthere had been a storm

Every among the over examples expresses the there definitely is/was/... A storm.

Now i would choose to to express that ns think that there probably is/was/... A storm, because that example due to the fact that I experienced all the please trees. In the current tense it is very clear: there have to be a storm.

If I desire to to speak the exact same in the past perfect the word must won"t change: there must have been a storm.

What I carry out not understand is what form of indigenous must is this instance is. Why doesn"t the change? If i say I should go to school it changes to I had to walk to school in past perfect due to the fact that must is a Modal assistant then.

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edited Mar 13 "18 at 16:56

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First, keep in mind that there must had actually been a storm is no grammatical in many varieties of civicpride-kusatsu.net. There must have actually been a storm is what ns think friend meant.

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Secondly, the price is that must is a modal verb, yet like could that hasn"t acquired a previous tense. (Historically, they room both previous tenses, and also in some senses could still features as the past of can. Must is isolated, through no matching present-tense verb).

If you want to express duty in the past, must is not available, therefore you should substitute an additional expression, commonly have to (which means almost the same as must, and also has a past tense: had to).

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edited Mar 13 "18 in ~ 17:05

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answer Mar 13 "18 at 16:56

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