could graph
Regular verb: graph - graphed- graphed

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could graph
you could graph
she could graph
we could graph
you could graph
they could graph 	I could be graphing
you could be graphing
she could be graphing
we could be graphing
you could be graphing
they could be graphing	I could have graphed
you could have graphed
she could have graphed
we could have graphed
you could have graphed
they could have graphed	I could have been graphing
you could have been graphing
she could have been graphing
we could have been graphing
you could have been graphing
they could have been graphing	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't graph
you couldn't graph
she couldn't graph
we couldn't graph
you couldn't graph
they couldn't graph 	I couldn't be graphing
you couldn't be graphing
she couldn't be graphing
we couldn't be graphing
you couldn't be graphing
they couldn't be graphing	I couldn't have graphed
you couldn't have graphed
she couldn't have graphed
we couldn't have graphed
you couldn't have graphed
they couldn't have graphed	I couldn't have been graphing
you couldn't have been graphing
she couldn't have been graphing
we couldn't have been graphing
you couldn't have been graphing
they couldn't have been graphing	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I graph?
could you graph?
could she graph?
could we graph?
could you graph?
could they graph? 	could I be graphing?
could you be graphing?
could she be graphing?
could we be graphing?
could you be graphing?
could they be graphing? 	could I have graphed?
could you have graphed?
could she have graphed?
could we have graphed?
could you have graphed?
could they have graphed? 	could I have been graphing?
could you have been graphing?
could she have been graphing?
could we have been graphing?
could you have been graphing?
could they have been graphing? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I graph?
couldn't you graph?
couldn't she graph?
couldn't we graph?
couldn't you graph?
couldn't they graph? 	couldn't I be graphing?
couldn't you be graphing?
couldn't she be graphing?
couldn't we be graphing?
couldn't you be graphing?
couldn't they be graphing? 	couldn't I have graphed?
couldn't you have graphed?
couldn't she have graphed?
couldn't we have graphed?
couldn't you have graphed?
couldn't they have graphed? 	couldn't I have been graphing?
couldn't you have been graphing?
couldn't she have been graphing?
couldn't we have been graphing?
couldn't you have been graphing?
couldn't they have been graphing?