could color
Regular verb: color - colored- colored

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could color
you could color
he could color
we could color
you could color
they could color 	I could be coloring
you could be coloring
he could be coloring
we could be coloring
you could be coloring
they could be coloring	I could have colored
you could have colored
he could have colored
we could have colored
you could have colored
they could have colored	I could have been coloring
you could have been coloring
he could have been coloring
we could have been coloring
you could have been coloring
they could have been coloring	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could not color
you could not color
he could not color
we could not color
you could not color
they could not color 	I could not be coloring
you could not be coloring
he could not be coloring
we could not be coloring
you could not be coloring
they could not be coloring	I could not have colored
you could not have colored
he could not have colored
we could not have colored
you could not have colored
they could not have colored	I could not have been coloring
you could not have been coloring
he could not have been coloring
we could not have been coloring
you could not have been coloring
they could not have been coloring	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I color?
could you color?
could he color?
could we color?
could you color?
could they color? 	could I be coloring?
could you be coloring?
could he be coloring?
could we be coloring?
could you be coloring?
could they be coloring? 	could I have colored?
could you have colored?
could he have colored?
could we have colored?
could you have colored?
could they have colored? 	could I have been coloring?
could you have been coloring?
could he have been coloring?
could we have been coloring?
could you have been coloring?
could they have been coloring? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I not color?
could you not color?
could he not color?
could we not color?
could you not color?
could they not color? 	could I not be coloring?
could you not be coloring?
could he not be coloring?
could we not be coloring?
could you not be coloring?
could they not be coloring? 	could I not have colored?
could you not have colored?
could he not have colored?
could we not have colored?
could you not have colored?
could they not have colored? 	could I not have been coloring?
could you not have been coloring?
could he not have been coloring?
could we not have been coloring?
could you not have been coloring?
could they not have been coloring?