can maintain
Regular verb: maintain - maintained- maintained

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I can maintain
you can maintain
he can maintain
we can maintain
you can maintain
they can maintain 	I can be maintaining
you can be maintaining
he can be maintaining
we can be maintaining
you can be maintaining
they can be maintaining	I can have maintained
you can have maintained
he can have maintained
we can have maintained
you can have maintained
they can have maintained	I can have been maintaining
you can have been maintaining
he can have been maintaining
we can have been maintaining
you can have been maintaining
they can have been maintaining	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I can't maintain
you can't maintain
he can't maintain
we can't maintain
you can't maintain
they can't maintain 	I can't be maintaining
you can't be maintaining
he can't be maintaining
we can't be maintaining
you can't be maintaining
they can't be maintaining	I can't have maintained
you can't have maintained
he can't have maintained
we can't have maintained
you can't have maintained
they can't have maintained	I can't have been maintaining
you can't have been maintaining
he can't have been maintaining
we can't have been maintaining
you can't have been maintaining
they can't have been maintaining	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
can I maintain?
can you maintain?
can he maintain?
can we maintain?
can you maintain?
can they maintain? 	can I be maintaining?
can you be maintaining?
can he be maintaining?
can we be maintaining?
can you be maintaining?
can they be maintaining? 	can I have maintained?
can you have maintained?
can he have maintained?
can we have maintained?
can you have maintained?
can they have maintained? 	can I have been maintaining?
can you have been maintaining?
can he have been maintaining?
can we have been maintaining?
can you have been maintaining?
can they have been maintaining? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
can't I maintain?
can't you maintain?
can't he maintain?
can't we maintain?
can't you maintain?
can't they maintain? 	can't I be maintaining?
can't you be maintaining?
can't he be maintaining?
can't we be maintaining?
can't you be maintaining?
can't they be maintaining? 	can't I have maintained?
can't you have maintained?
can't he have maintained?
can't we have maintained?
can't you have maintained?
can't they have maintained? 	can't I have been maintaining?
can't you have been maintaining?
can't he have been maintaining?
can't we have been maintaining?
can't you have been maintaining?
can't they have been maintaining?