The Conjugator
English verb conjugation
CAN HAPPEN

Regular verb: happen - happened - happened

Affirmation

Simple form

V-ing form

-
-
it can happen
-
-
-		-
-
it can be happening
-
-
-

Perfect

V-ing perfect

-
-
it can have happened
-
-
-		-
-
it can have been happening
-
-
-

Negation

Simple form

V-ing form

-
-
it cannot happen
-
-
-		-
-
it cannot be happening
-
-
-

Perfect

V-ing perfect

-
-
it cannot have happened
-
-
-		-
-
it cannot have been happening
-
-
-

Interrogative form

Simple form

V-ing form

-
-
can it happen?
-
-
-		-
-
can it be happening?
-
-
-

Perfect

V-ing perfect

-
-
can it have happened?
-
-
-		-
-
can it have been happening?
-
-
-

Interro-negative form

Simple form

V-ing form

-
-
can it not happen?
-
-
-		-
-
can it not be happening?
-
-
-

Perfect

V-ing perfect

-
-
can it not have happened?
-
-
-		-
-
can it not have been happening?
-
-
-