Conjugation of verb "To use"
Present Simple Continuous
Present Perfect Continuous
Affirmative
He/She/It has been using.
Negative
He/She/It has not been using.
They have not been using.
Interrogative
Has he/she/it been using?
Affirmative
He/She/It had been using.
Negative
He/She/It had not been using.
Interrogative
Had he/she/it been using?
Affirmative
He/She/It will have used.
Negative
He/She/It will not have used.
Interrogative
Will he/she/it have used?
Affirmative
He/She/It would have used.
Negative
He/She/It would not have used.
They would not have used.
Interrogative
Would he/she/it have used?