I can matter you can matter he can matter we can matter you can matter they can matter
V-ing form
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
I can have mattered you can have mattered he can have mattered we can have mattered you can have mattered they can have mattered
V-ing perfect
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
I cannot matter you cannot matter he cannot matter we cannot matter you cannot matter they cannot matter
V-ing form
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
I cannot have mattered you cannot have mattered he cannot have mattered we cannot have mattered you cannot have mattered they cannot have mattered
V-ing perfect
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
can I matter? can you matter? can he matter? can we matter? can you matter? can they matter?
V-ing form
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
can I have mattered? can you have mattered? can he have mattered? can we have mattered? can you have mattered? can they have mattered?
V-ing perfect
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
can I not matter? can you not matter? can he not matter? can we not matter? can you not matter? can they not matter?
V-ing form
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
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?
V-ing perfect
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?