can maintain
Regular verb: maintain - maintained- maintained

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