could obsolesce
Regular verb: obsolesce - obsolesced- obsolesced

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could obsolesce
you could obsolesce
he could obsolesce
we could obsolesce
you could obsolesce
they could obsolesce 	I could be obsolescing
you could be obsolescing
he could be obsolescing
we could be obsolescing
you could be obsolescing
they could be obsolescing	I could have obsolesced
you could have obsolesced
he could have obsolesced
we could have obsolesced
you could have obsolesced
they could have obsolesced	I could have been obsolescing
you could have been obsolescing
he could have been obsolescing
we could have been obsolescing
you could have been obsolescing
they could have been obsolescing	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't obsolesce
you couldn't obsolesce
he couldn't obsolesce
we couldn't obsolesce
you couldn't obsolesce
they couldn't obsolesce 	I couldn't be obsolescing
you couldn't be obsolescing
he couldn't be obsolescing
we couldn't be obsolescing
you couldn't be obsolescing
they couldn't be obsolescing	I couldn't have obsolesced
you couldn't have obsolesced
he couldn't have obsolesced
we couldn't have obsolesced
you couldn't have obsolesced
they couldn't have obsolesced	I couldn't have been obsolescing
you couldn't have been obsolescing
he couldn't have been obsolescing
we couldn't have been obsolescing
you couldn't have been obsolescing
they couldn't have been obsolescing	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I obsolesce?
could you obsolesce?
could he obsolesce?
could we obsolesce?
could you obsolesce?
could they obsolesce? 	could I be obsolescing?
could you be obsolescing?
could he be obsolescing?
could we be obsolescing?
could you be obsolescing?
could they be obsolescing? 	could I have obsolesced?
could you have obsolesced?
could he have obsolesced?
could we have obsolesced?
could you have obsolesced?
could they have obsolesced? 	could I have been obsolescing?
could you have been obsolescing?
could he have been obsolescing?
could we have been obsolescing?
could you have been obsolescing?
could they have been obsolescing? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I obsolesce?
couldn't you obsolesce?
couldn't he obsolesce?
couldn't we obsolesce?
couldn't you obsolesce?
couldn't they obsolesce? 	couldn't I be obsolescing?
couldn't you be obsolescing?
couldn't he be obsolescing?
couldn't we be obsolescing?
couldn't you be obsolescing?
couldn't they be obsolescing? 	couldn't I have obsolesced?
couldn't you have obsolesced?
couldn't he have obsolesced?
couldn't we have obsolesced?
couldn't you have obsolesced?
couldn't they have obsolesced? 	couldn't I have been obsolescing?
couldn't you have been obsolescing?
couldn't he have been obsolescing?
couldn't we have been obsolescing?
couldn't you have been obsolescing?
couldn't they have been obsolescing?