Conjugation of verb "To happen"
Negative
He/She/It doesn't happen.
Present Simple Continuous
Negative
He/She/It isn't happenning.
Affirmative
He/She/It was happenning.
Negative
He/She/It wasn't happenning.
Interrogative
Was he/she/it happenning?
Negative
He/She/It hasn't happenned.
Present Perfect Continuous
Affirmative
He/She/It's been happenning.
Negative
I haven't been happenning.
You haven't been happenning.
We haven't been happenning.
He/She/It hasn't been happenning.
You haven't been happenning.
They haven't been happenning.
Interrogative
Have you been happenning?
Has he/she/it been happenning?
Have you been happenning?
Have they been happenning?
Negative
He/She/It hadn't happenned.
Affirmative
He/She/It'd been happenning.
Negative
I hadn't been happenning.
You hadn't been happenning.
We hadn't been happenning.
He/She/It hadn't been happenning.
You hadn't been happenning.
They hadn't been happenning.
Interrogative
Had he/she/it been happenning?
Had they been happenning?
Affirmative
He/She/It'll have happenned.
Negative
You won't have happenned.
He/She/It won't have happenned.
You won't have happenned.
They won't have happenned.
Interrogative
Will he/she/it have happenned?
Will they have happenned?
Negative
He/She/It wouldn't happen.
Affirmative
He/She/It'd have happenned.
Negative
I wouldn't have happenned.
You wouldn't have happenned.
We wouldn't have happenned.
He/She/It wouldn't have happenned.
You wouldn't have happenned.
They wouldn't have happenned.
Interrogative
Would you have happenned?
Would he/she/it have happenned?
Would you have happenned?
Would they have happenned?