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