English verb conjugation
CAN MATTER

Regular verb: matter - mattered - mattered

Affirmation

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

Negation

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

Interrogative form

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

Interro-negative form

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