can matter
Regular verb: matter - mattered- mattered

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