could dampen
Regular verb: dampen - dampened- dampened

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could dampen
you could dampen
she could dampen
we could dampen
you could dampen
they could dampen 	I could be dampening
you could be dampening
she could be dampening
we could be dampening
you could be dampening
they could be dampening	I could have dampened
you could have dampened
she could have dampened
we could have dampened
you could have dampened
they could have dampened	I could have been dampening
you could have been dampening
she could have been dampening
we could have been dampening
you could have been dampening
they could have been dampening	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could not dampen
you could not dampen
she could not dampen
we could not dampen
you could not dampen
they could not dampen 	I could not be dampening
you could not be dampening
she could not be dampening
we could not be dampening
you could not be dampening
they could not be dampening	I could not have dampened
you could not have dampened
she could not have dampened
we could not have dampened
you could not have dampened
they could not have dampened	I could not have been dampening
you could not have been dampening
she could not have been dampening
we could not have been dampening
you could not have been dampening
they could not have been dampening	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I dampen?
could you dampen?
could she dampen?
could we dampen?
could you dampen?
could they dampen? 	could I be dampening?
could you be dampening?
could she be dampening?
could we be dampening?
could you be dampening?
could they be dampening? 	could I have dampened?
could you have dampened?
could she have dampened?
could we have dampened?
could you have dampened?
could they have dampened? 	could I have been dampening?
could you have been dampening?
could she have been dampening?
could we have been dampening?
could you have been dampening?
could they have been dampening? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I not dampen?
could you not dampen?
could she not dampen?
could we not dampen?
could you not dampen?
could they not dampen? 	could I not be dampening?
could you not be dampening?
could she not be dampening?
could we not be dampening?
could you not be dampening?
could they not be dampening? 	could I not have dampened?
could you not have dampened?
could she not have dampened?
could we not have dampened?
could you not have dampened?
could they not have dampened? 	could I not have been dampening?
could you not have been dampening?
could she not have been dampening?
could we not have been dampening?
could you not have been dampening?
could they not have been dampening?