English verb conjugation
COULD QUIETEN

Regular verb: quieten - quietened - quietened

Affirmation

Simple form	V-ing form
I could quieten you could quieten he could quieten we could quieten you could quieten they could quieten	I could be quietening you could be quietening he could be quietening we could be quietening you could be quietening they could be quietening
Perfect	V-ing perfect
I could have quietened you could have quietened he could have quietened we could have quietened you could have quietened they could have quietened	I could have been quietening you could have been quietening he could have been quietening we could have been quietening you could have been quietening they could have been quietening

Negation

Simple form	V-ing form
I could not quieten you could not quieten he could not quieten we could not quieten you could not quieten they could not quieten	I could not be quietening you could not be quietening he could not be quietening we could not be quietening you could not be quietening they could not be quietening
Perfect	V-ing perfect
I could not have quietened you could not have quietened he could not have quietened we could not have quietened you could not have quietened they could not have quietened	I could not have been quietening you could not have been quietening he could not have been quietening we could not have been quietening you could not have been quietening they could not have been quietening

Interrogative form

Simple form	V-ing form
could I quieten? could you quieten? could he quieten? could we quieten? could you quieten? could they quieten?	could I be quietening? could you be quietening? could he be quietening? could we be quietening? could you be quietening? could they be quietening?
Perfect	V-ing perfect
could I have quietened? could you have quietened? could he have quietened? could we have quietened? could you have quietened? could they have quietened?	could I have been quietening? could you have been quietening? could he have been quietening? could we have been quietening? could you have been quietening? could they have been quietening?

Interro-negative form

Simple form	V-ing form
could I not quieten? could you not quieten? could he not quieten? could we not quieten? could you not quieten? could they not quieten?	could I not be quietening? could you not be quietening? could he not be quietening? could we not be quietening? could you not be quietening? could they not be quietening?
Perfect	V-ing perfect
could I not have quietened? could you not have quietened? could he not have quietened? could we not have quietened? could you not have quietened? could they not have quietened?	could I not have been quietening? could you not have been quietening? could he not have been quietening? could we not have been quietening? could you not have been quietening? could they not have been quietening?