Must have been definition????

Question

hi i want to know how to use '' must have been " and i also want to know the definition, structure, formation of the affirmative, negative, and interrogative forms

Sundarnaz · Accepted Answer

study englishHi, I want to know how to use "must have been", and I also want to know the definition, structure, formation of the affirmative, negative, and interrogative forms.

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CalifJim · Answer

study english~~I want~~ I would like to know how to use '' "must have been", and I would also ~~want~~ like to know the definition, structure, formation of the affirmative, negative, and interrogative forms.

Strange. Your English is advanced enough to spell "interrogative" correctly, and even to ask questions about a modal perfect tense, but you still haven't mastered the fact that the word "I" is always capitalized, and sentences are supposed to end with a period.

Affirmative: (it) must have been
Negative: (it) must not have been
Interrogative: must (it) have been?
Negative interrogative:  must (it) not have been?

The basic use of must have been is as the past of must be. Both of these contain the idea "the only logical conclusion from this evidence".

The dog is scratching at the door.  He must want to go out. (The only logical conclusion from this evidence is that he wants to go out.)
The dog was scratching at the door. He must have wanted to go out. (The only logical conclusion from this evidence is that he wanted to go out.)

CJ

Must have been definition????

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