must have use observe in sentence
Observe Verb Forms
| Base form (v1) |
Observe |
| Past form (v2) |
Observed |
Past Participle (v3)
-ed form |
Observed |
Present Participle (v4)
‘ing’ form |
Observing |
Present simple (v5)
s / es/ ies |
Observes |
MUST HAVE use -observe verb forms
POSITIVE STATEMENT:
I must have observed
situation
We must have observed
situation
You must have observed
situation
They must have observed
situation
He must have observed
situation
She must have observed
situation
It must have observed
situation
Name must have observed
situation
QUESTION:
must I have observed
situation
?
must We have observed
situation
?
must You have observed
situation
?
must They have observed
situation
?
must He have observed
situation
?
must She have observed
situation
?
must It have observed
situation
?
must Name have observed
situation
?
