Conjugation of verb "To sing"
Present Simple ContinuousNegative
He/She/It wasn't singing. Present Perfect ContinuousAffirmative
He/She/It's been singing.Negative
You haven't been singing.
He/She/It hasn't been singing.
You haven't been singing.
They haven't been singing.Interrogative
Has he/she/it been singing?Affirmative
He/She/It'd been singing.Negative
He/She/It hadn't been singing.
They hadn't been singing.Interrogative
Had he/she/it been singing?Negative
He/She/It won't have sung.Interrogative
Will he/she/it have sung?Negative
He/She/It wouldn't have sung.Interrogative
Would he/she/it have sung?