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 cannot matter you cannot matter he cannot matter we cannot matter you cannot matter they cannot matter	I cannot be mattering you cannot be mattering he cannot be mattering we cannot be mattering you cannot be mattering they cannot be mattering
Perfect	V-ing perfect
I cannot have mattered you cannot have mattered he cannot have mattered we cannot have mattered you cannot have mattered they cannot have mattered	I cannot have been mattering you cannot have been mattering he cannot have been mattering we cannot have been mattering you cannot have been mattering they cannot 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 I not matter? can you not matter? can he not matter? can we not matter? can you not matter? can they not matter?	can I not be mattering? can you not be mattering? can he not be mattering? can we not be mattering? can you not be mattering? can they not be mattering?
Perfect	V-ing perfect
can I not have mattered? can you not have mattered? can he not have mattered? can we not have mattered? can you not have mattered? can they not have mattered?	can I not have been mattering? can you not have been mattering? can he not have been mattering? can we not have been mattering? can you not have been mattering? can they not have been mattering?