English verb conjugation OUGHT TO HAPPEN

Regular verb: happen - happened - happened

Affirmation

Simple form

-
-
it ought to happen
-
-
-

V-ing form

-
-
it ought to be happening
-
-
-

Perfect

-
-
it ought to have happened
-
-
-

V-ing perfect

-
-
it ought to have been happening
-
-
-

Simple form

-
-
it oughtn't to happen
-
-
-

V-ing form

-
-
it oughtn't to be happening
-
-
-

Perfect

-
-
it oughtn't to have happened
-
-
-

V-ing perfect

-
-
it oughtn't to have been happening
-
-
-

Simple form

-
-
ought to it happen?
-
-
-

V-ing form

-
-
ought to it be happening?
-
-
-

Perfect

-
-
ought to it have happened?
-
-
-

V-ing perfect

-
-
ought to it have been happening?
-
-
-

Simple form

-
-
oughtn't it to happen?
-
-
-

V-ing form

-
-
oughtn't it to be happening?
-
-
-

Perfect

-
-
oughtn't it to have happened?
-
-
-

V-ing perfect

-
-
oughtn't it to have been happening?
-
-
-