English verb conjugation
COULD GRAPH

Regular verb: graph - graphed - graphed

Affirmation

Simple form	V-ing form
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
Perfect	V-ing perfect
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
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
Perfect	V-ing perfect
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
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?
Perfect	V-ing perfect
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
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?
Perfect	V-ing perfect
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?