may dampen
Regular verb: dampen - dampened- dampened

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

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mayn't dampen
you mayn't dampen
she mayn't dampen
we mayn't dampen
you mayn't dampen
they mayn't dampen 	I mayn't be dampening
you mayn't be dampening
she mayn't be dampening
we mayn't be dampening
you mayn't be dampening
they mayn't be dampening	I mayn't have dampened
you mayn't have dampened
she mayn't have dampened
we mayn't have dampened
you mayn't have dampened
they mayn't have dampened	I mayn't have been dampening
you mayn't have been dampening
she mayn't have been dampening
we mayn't have been dampening
you mayn't have been dampening
they mayn't have been dampening	

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

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