Conjugation of verb "To warn"
Present Simple Continuous
Negative
He/She/It is not warning.
Negative
He/She/It was not warning.
Negative
He/She/It has not warned.
Present Perfect Continuous
Affirmative
He/She/It has been warning.
Negative
You have not been warning.
We have not been warning.
He/She/It has not been warning.
You have not been warning.
They have not been warning.
Interrogative
Has he/she/it been warning?
Negative
He/She/It had not warned.
Affirmative
He/She/It had been warning.
Negative
You had not been warning.
He/She/It had not been warning.
You had not been warning.
They had not been warning.
Interrogative
Had he/she/it been warning?
Affirmative
He/She/It will have warned.
Negative
You will not have warned.
He/She/It will not have warned.
You will not have warned.
They will not have warned.
Interrogative
Will he/she/it have warned?
Negative
He/She/It would not warn.
Affirmative
He/She/It would have warned.
Negative
You would not have warned.
We would not have warned.
He/She/It would not have warned.
You would not have warned.
They would not have warned.
Interrogative
Would he/she/it have warned?