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