English verb conjugation
COULD QUIETEN

Regular verb: quieten - quietened - quietened

Affirmation

Simple form	V-ing form
I could quieten you could quieten she could quieten we could quieten you could quieten they could quieten	I could be quietening you could be quietening she 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 she 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 she 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 couldn't quieten you couldn't quieten she couldn't quieten we couldn't quieten you couldn't quieten they couldn't quieten	I couldn't be quietening you couldn't be quietening she couldn't be quietening we couldn't be quietening you couldn't be quietening they couldn't be quietening
Perfect	V-ing perfect
I couldn't have quietened you couldn't have quietened she couldn't have quietened we couldn't have quietened you couldn't have quietened they couldn't have quietened	I couldn't have been quietening you couldn't have been quietening she couldn't have been quietening we couldn't have been quietening you couldn't have been quietening they couldn't have been quietening

Interrogative form

Simple form	V-ing form
could I quieten? could you quieten? could she quieten? could we quieten? could you quieten? could they quieten?	could I be quietening? could you be quietening? could she 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 she 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 she 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
couldn't I quieten? couldn't you quieten? couldn't she quieten? couldn't we quieten? couldn't you quieten? couldn't they quieten?	couldn't I be quietening? couldn't you be quietening? couldn't she be quietening? couldn't we be quietening? couldn't you be quietening? couldn't they be quietening?
Perfect	V-ing perfect
couldn't I have quietened? couldn't you have quietened? couldn't she have quietened? couldn't we have quietened? couldn't you have quietened? couldn't they have quietened?	couldn't I have been quietening? couldn't you have been quietening? couldn't she have been quietening? couldn't we have been quietening? couldn't you have been quietening? couldn't they have been quietening?