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 cannot maintain
you cannot maintain
she cannot maintain
we cannot maintain
you cannot maintain
they cannot maintain 	I cannot be maintaining
you cannot be maintaining
she cannot be maintaining
we cannot be maintaining
you cannot be maintaining
they cannot be maintaining	I cannot have maintained
you cannot have maintained
she cannot have maintained
we cannot have maintained
you cannot have maintained
they cannot have maintained	I cannot have been maintaining
you cannot have been maintaining
she cannot have been maintaining
we cannot have been maintaining
you cannot have been maintaining
they cannot 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 I not maintain?
can you not maintain?
can she not maintain?
can we not maintain?
can you not maintain?
can they not maintain? 	can I not be maintaining?
can you not be maintaining?
can she not be maintaining?
can we not be maintaining?
can you not be maintaining?
can they not be maintaining? 	can I not have maintained?
can you not have maintained?
can she not have maintained?
can we not have maintained?
can you not have maintained?
can they not have maintained? 	can I not have been maintaining?
can you not have been maintaining?
can she not have been maintaining?
can we not have been maintaining?
can you not have been maintaining?
can they not have been maintaining?