could retool
Regular verb: retool - retooled- retooled

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could retool
you could retool
she could retool
we could retool
you could retool
they could retool 	I could be retooling
you could be retooling
she could be retooling
we could be retooling
you could be retooling
they could be retooling	I could have retooled
you could have retooled
she could have retooled
we could have retooled
you could have retooled
they could have retooled	I could have been retooling
you could have been retooling
she could have been retooling
we could have been retooling
you could have been retooling
they could have been retooling	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't retool
you couldn't retool
she couldn't retool
we couldn't retool
you couldn't retool
they couldn't retool 	I couldn't be retooling
you couldn't be retooling
she couldn't be retooling
we couldn't be retooling
you couldn't be retooling
they couldn't be retooling	I couldn't have retooled
you couldn't have retooled
she couldn't have retooled
we couldn't have retooled
you couldn't have retooled
they couldn't have retooled	I couldn't have been retooling
you couldn't have been retooling
she couldn't have been retooling
we couldn't have been retooling
you couldn't have been retooling
they couldn't have been retooling	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I retool?
could you retool?
could she retool?
could we retool?
could you retool?
could they retool? 	could I be retooling?
could you be retooling?
could she be retooling?
could we be retooling?
could you be retooling?
could they be retooling? 	could I have retooled?
could you have retooled?
could she have retooled?
could we have retooled?
could you have retooled?
could they have retooled? 	could I have been retooling?
could you have been retooling?
could she have been retooling?
could we have been retooling?
could you have been retooling?
could they have been retooling? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I retool?
couldn't you retool?
couldn't she retool?
couldn't we retool?
couldn't you retool?
couldn't they retool? 	couldn't I be retooling?
couldn't you be retooling?
couldn't she be retooling?
couldn't we be retooling?
couldn't you be retooling?
couldn't they be retooling? 	couldn't I have retooled?
couldn't you have retooled?
couldn't she have retooled?
couldn't we have retooled?
couldn't you have retooled?
couldn't they have retooled? 	couldn't I have been retooling?
couldn't you have been retooling?
couldn't she have been retooling?
couldn't we have been retooling?
couldn't you have been retooling?
couldn't they have been retooling?