Conjugation of verb "To warn"
Present Simple Continuous
Negative
He/She/It wasn't warning.
Present Perfect Continuous
Affirmative
He/She/It's been warning.
Negative
You haven't been warning.
He/She/It hasn't been warning.
You haven't been warning.
They haven't been warning.
Interrogative
Has he/she/it been warning?
Affirmative
He/She/It'd been warning.
Negative
He/She/It hadn't been warning.
They hadn't been warning.
Interrogative
Had he/she/it been warning?
Affirmative
He/She/It'll have warned.
Negative
He/She/It won't have warned.
Interrogative
Will he/she/it have warned?
Negative
You wouldn't have warned.
He/She/It wouldn't have warned.
You wouldn't have warned.
They wouldn't have warned.
Interrogative
Would he/she/it have warned?