could quieten
Regular verb: quieten - quietened- quietened

Affirmation 	
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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	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 	
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I couldn't quieten
you couldn't quieten
he 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
he couldn't be quietening
we couldn't be quietening
you couldn't be quietening
they couldn't be quietening	I couldn't have quietened
you couldn't have quietened
he 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
he 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 	
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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? 	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 	
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couldn't I quieten?
couldn't you quieten?
couldn't he 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 he be quietening?
couldn't we be quietening?
couldn't you be quietening?
couldn't they be quietening? 	couldn't I have quietened?
couldn't you have quietened?
couldn't he 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 he have been quietening?
couldn't we have been quietening?
couldn't you have been quietening?
couldn't they have been quietening?