could tool
Regular verb: tool - tooled- tooled

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could tool
you could tool
he could tool
we could tool
you could tool
they could tool 	I could be tooling
you could be tooling
he could be tooling
we could be tooling
you could be tooling
they could be tooling	I could have tooled
you could have tooled
he could have tooled
we could have tooled
you could have tooled
they could have tooled	I could have been tooling
you could have been tooling
he could have been tooling
we could have been tooling
you could have been tooling
they could have been tooling	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could not tool
you could not tool
he could not tool
we could not tool
you could not tool
they could not tool 	I could not be tooling
you could not be tooling
he could not be tooling
we could not be tooling
you could not be tooling
they could not be tooling	I could not have tooled
you could not have tooled
he could not have tooled
we could not have tooled
you could not have tooled
they could not have tooled	I could not have been tooling
you could not have been tooling
he could not have been tooling
we could not have been tooling
you could not have been tooling
they could not have been tooling	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I tool?
could you tool?
could he tool?
could we tool?
could you tool?
could they tool? 	could I be tooling?
could you be tooling?
could he be tooling?
could we be tooling?
could you be tooling?
could they be tooling? 	could I have tooled?
could you have tooled?
could he have tooled?
could we have tooled?
could you have tooled?
could they have tooled? 	could I have been tooling?
could you have been tooling?
could he have been tooling?
could we have been tooling?
could you have been tooling?
could they have been tooling? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I not tool?
could you not tool?
could he not tool?
could we not tool?
could you not tool?
could they not tool? 	could I not be tooling?
could you not be tooling?
could he not be tooling?
could we not be tooling?
could you not be tooling?
could they not be tooling? 	could I not have tooled?
could you not have tooled?
could he not have tooled?
could we not have tooled?
could you not have tooled?
could they not have tooled? 	could I not have been tooling?
could you not have been tooling?
could he not have been tooling?
could we not have been tooling?
could you not have been tooling?
could they not have been tooling?