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