English verb conjugation
COULD MATTER

Regular verb: matter - mattered - mattered

Affirmation

Simple form	V-ing form
I could matter you could matter he could matter we could matter you could matter they could matter	I could be mattering you could be mattering he could be mattering we could be mattering you could be mattering they could be mattering
Perfect	V-ing perfect
I could have mattered you could have mattered he could have mattered we could have mattered you could have mattered they could have mattered	I could have been mattering you could have been mattering he could have been mattering we could have been mattering you could have been mattering they could have been mattering

Negation

Simple form	V-ing form
I couldn't matter you couldn't matter he couldn't matter we couldn't matter you couldn't matter they couldn't matter	I couldn't be mattering you couldn't be mattering he couldn't be mattering we couldn't be mattering you couldn't be mattering they couldn't be mattering
Perfect	V-ing perfect
I couldn't have mattered you couldn't have mattered he couldn't have mattered we couldn't have mattered you couldn't have mattered they couldn't have mattered	I couldn't have been mattering you couldn't have been mattering he couldn't have been mattering we couldn't have been mattering you couldn't have been mattering they couldn't have been mattering

Interrogative form

Simple form	V-ing form
could I matter? could you matter? could he matter? could we matter? could you matter? could they matter?	could I be mattering? could you be mattering? could he be mattering? could we be mattering? could you be mattering? could they be mattering?
Perfect	V-ing perfect
could I have mattered? could you have mattered? could he have mattered? could we have mattered? could you have mattered? could they have mattered?	could I have been mattering? could you have been mattering? could he have been mattering? could we have been mattering? could you have been mattering? could they have been mattering?

Interro-negative form

Simple form	V-ing form
couldn't I matter? couldn't you matter? couldn't he matter? couldn't we matter? couldn't you matter? couldn't they matter?	couldn't I be mattering? couldn't you be mattering? couldn't he be mattering? couldn't we be mattering? couldn't you be mattering? couldn't they be mattering?
Perfect	V-ing perfect
couldn't I have mattered? couldn't you have mattered? couldn't he have mattered? couldn't we have mattered? couldn't you have mattered? couldn't they have mattered?	couldn't I have been mattering? couldn't you have been mattering? couldn't he have been mattering? couldn't we have been mattering? couldn't you have been mattering? couldn't they have been mattering?