could prewarm
Regular verb: prewarm - prewarmed- prewarmed

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could prewarm
you could prewarm
she could prewarm
we could prewarm
you could prewarm
they could prewarm 	I could be prewarming
you could be prewarming
she could be prewarming
we could be prewarming
you could be prewarming
they could be prewarming	I could have prewarmed
you could have prewarmed
she could have prewarmed
we could have prewarmed
you could have prewarmed
they could have prewarmed	I could have been prewarming
you could have been prewarming
she could have been prewarming
we could have been prewarming
you could have been prewarming
they could have been prewarming	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't prewarm
you couldn't prewarm
she couldn't prewarm
we couldn't prewarm
you couldn't prewarm
they couldn't prewarm 	I couldn't be prewarming
you couldn't be prewarming
she couldn't be prewarming
we couldn't be prewarming
you couldn't be prewarming
they couldn't be prewarming	I couldn't have prewarmed
you couldn't have prewarmed
she couldn't have prewarmed
we couldn't have prewarmed
you couldn't have prewarmed
they couldn't have prewarmed	I couldn't have been prewarming
you couldn't have been prewarming
she couldn't have been prewarming
we couldn't have been prewarming
you couldn't have been prewarming
they couldn't have been prewarming	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I prewarm?
could you prewarm?
could she prewarm?
could we prewarm?
could you prewarm?
could they prewarm? 	could I be prewarming?
could you be prewarming?
could she be prewarming?
could we be prewarming?
could you be prewarming?
could they be prewarming? 	could I have prewarmed?
could you have prewarmed?
could she have prewarmed?
could we have prewarmed?
could you have prewarmed?
could they have prewarmed? 	could I have been prewarming?
could you have been prewarming?
could she have been prewarming?
could we have been prewarming?
could you have been prewarming?
could they have been prewarming? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I prewarm?
couldn't you prewarm?
couldn't she prewarm?
couldn't we prewarm?
couldn't you prewarm?
couldn't they prewarm? 	couldn't I be prewarming?
couldn't you be prewarming?
couldn't she be prewarming?
couldn't we be prewarming?
couldn't you be prewarming?
couldn't they be prewarming? 	couldn't I have prewarmed?
couldn't you have prewarmed?
couldn't she have prewarmed?
couldn't we have prewarmed?
couldn't you have prewarmed?
couldn't they have prewarmed? 	couldn't I have been prewarming?
couldn't you have been prewarming?
couldn't she have been prewarming?
couldn't we have been prewarming?
couldn't you have been prewarming?
couldn't they have been prewarming?