must have use know in sentence

Know Verb Forms

Base form (v1) Know
Past form (v2) Knew
Past Participle (v3)
-ed form
Known
Present Participle (v4)
‘ing’ form
Knowing
Present simple (v5)
s / es/ ies
Knows

MUST HAVE use -know verb forms


POSITIVE STATEMENT:

I must have known
situation
We must have known
situation
You must have known
situation
They must have known
situation
He must have known
situation
She must have known
situation
It must have known
situation
Name must have known
situation
QUESTION:

must I have known
situation
?
must We have known
situation
?
must You have known
situation
?
must They have known
situation
?
must He have known
situation
?
must She have known
situation
?
must It have known
situation
?
must Name have known
situation
?

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