could retool
Regular verb: retool - retooled- retooled

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could retool
you could retool
he could retool
we could retool
you could retool
they could retool 	I could be retooling
you could be retooling
he could be retooling
we could be retooling
you could be retooling
they could be retooling	I could have retooled
you could have retooled
he 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
he 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 could not retool
you could not retool
he could not retool
we could not retool
you could not retool
they could not retool 	I could not be retooling
you could not be retooling
he could not be retooling
we could not be retooling
you could not be retooling
they could not be retooling	I could not have retooled
you could not have retooled
he could not have retooled
we could not have retooled
you could not have retooled
they could not have retooled	I could not have been retooling
you could not have been retooling
he could not have been retooling
we could not have been retooling
you could not have been retooling
they could not have been retooling	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I retool?
could you retool?
could he retool?
could we retool?
could you retool?
could they retool? 	could I be retooling?
could you be retooling?
could he be retooling?
could we be retooling?
could you be retooling?
could they be retooling? 	could I have retooled?
could you have retooled?
could he 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 he 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 	
could I not retool?
could you not retool?
could he not retool?
could we not retool?
could you not retool?
could they not retool? 	could I not be retooling?
could you not be retooling?
could he not be retooling?
could we not be retooling?
could you not be retooling?
could they not be retooling? 	could I not have retooled?
could you not have retooled?
could he not have retooled?
could we not have retooled?
could you not have retooled?
could they not have retooled? 	could I not have been retooling?
could you not have been retooling?
could he not have been retooling?
could we not have been retooling?
could you not have been retooling?
could they not have been retooling?