The Conjugator
English verb conjugation
SHOULD HAPPEN

Regular verb: happen - happened - happened

Affirmation

Simple form

V-ing form

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-
it should happen
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-
-		-
-
it should be happening
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-
-

Perfect

V-ing perfect

-
-
it should have happened
-
-
-		-
-
it should have been happening
-
-
-

Negation

Simple form

V-ing form

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-
it should not happen
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-
-		-
-
it should not be happening
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-
-

Perfect

V-ing perfect

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-
it should not have happened
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-
-		-
-
it should not have been happening
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-
-

Interrogative form

Simple form

V-ing form

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-
should it happen?
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-
-		-
-
should it be happening?
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-
-

Perfect

V-ing perfect

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-
should it have happened?
-
-
-		-
-
should it have been happening?
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-
-

Interro-negative form

Simple form

V-ing form

-
-
should it not happen?
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-
-		-
-
should it not be happening?
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-
-

Perfect

V-ing perfect

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