could quieten quieten
Verbo regular: quieten quieten - quieten quietened- quieten quietened

, este verbo pode não existir, a conjugação é dada como exemplo.

Afirmação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I could quieten quieten
you could quieten quieten
she could quieten quieten
we could quieten quieten
you could quieten quieten
they could quieten quieten 	I could be quieten quietening
you could be quieten quietening
she could be quieten quietening
we could be quieten quietening
you could be quieten quietening
they could be quieten quietening	I could have quieten quietened
you could have quieten quietened
she could have quieten quietened
we could have quieten quietened
you could have quieten quietened
they could have quieten quietened	I could have been quieten quietening
you could have been quieten quietening
she could have been quieten quietening
we could have been quieten quietening
you could have been quieten quietening
they could have been quieten quietening	

Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I couldn't quieten quieten
you couldn't quieten quieten
she couldn't quieten quieten
we couldn't quieten quieten
you couldn't quieten quieten
they couldn't quieten quieten 	I couldn't be quieten quietening
you couldn't be quieten quietening
she couldn't be quieten quietening
we couldn't be quieten quietening
you couldn't be quieten quietening
they couldn't be quieten quietening	I couldn't have quieten quietened
you couldn't have quieten quietened
she couldn't have quieten quietened
we couldn't have quieten quietened
you couldn't have quieten quietened
they couldn't have quieten quietened	I couldn't have been quieten quietening
you couldn't have been quieten quietening
she couldn't have been quieten quietening
we couldn't have been quieten quietening
you couldn't have been quieten quietening
they couldn't have been quieten quietening	

Forma interrogativa 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
could I quieten quieten?
could you quieten quieten?
could she quieten quieten?
could we quieten quieten?
could you quieten quieten?
could they quieten quieten? 	could I be quieten quietening?
could you be quieten quietening?
could she be quieten quietening?
could we be quieten quietening?
could you be quieten quietening?
could they be quieten quietening? 	could I have quieten quietened?
could you have quieten quietened?
could she have quieten quietened?
could we have quieten quietened?
could you have quieten quietened?
could they have quieten quietened? 	could I have been quieten quietening?
could you have been quieten quietening?
could she have been quieten quietening?
could we have been quieten quietening?
could you have been quieten quietening?
could they have been quieten quietening? 	

Forma interro-Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
couldn't I quieten quieten?
couldn't you quieten quieten?
couldn't she quieten quieten?
couldn't we quieten quieten?
couldn't you quieten quieten?
couldn't they quieten quieten? 	couldn't I be quieten quietening?
couldn't you be quieten quietening?
couldn't she be quieten quietening?
couldn't we be quieten quietening?
couldn't you be quieten quietening?
couldn't they be quieten quietening? 	couldn't I have quieten quietened?
couldn't you have quieten quietened?
couldn't she have quieten quietened?
couldn't we have quieten quietened?
couldn't you have quieten quietened?
couldn't they have quieten quietened? 	couldn't I have been quieten quietening?
couldn't you have been quieten quietening?
couldn't she have been quieten quietening?
couldn't we have been quieten quietening?
couldn't you have been quieten quietening?
couldn't they have been quieten quietening?