ought to maintain
Regular verb: maintain - maintained- maintained

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I ought to maintain
you ought to maintain
she ought to maintain
we ought to maintain
you ought to maintain
they ought to maintain 	I ought to be maintaining
you ought to be maintaining
she ought to be maintaining
we ought to be maintaining
you ought to be maintaining
they ought to be maintaining	I ought to have maintained
you ought to have maintained
she ought to have maintained
we ought to have maintained
you ought to have maintained
they ought to have maintained	I ought to have been maintaining
you ought to have been maintaining
she ought to have been maintaining
we ought to have been maintaining
you ought to have been maintaining
they ought to have been maintaining	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I ought not to maintain
you ought not to maintain
she ought not to maintain
we ought not to maintain
you ought not to maintain
they ought not to maintain 	I ought not to maintaining
you ought not to maintaining
she ought not to maintaining
we ought not to maintaining
you ought not to maintaining
they ought not to maintaining	I ought not to have maintained
you ought not to have maintained
she ought not to have maintained
we ought not to have maintained
you ought not to have maintained
they ought not to have maintained	I ought not to have been maintaining
you ought not to have been maintaining
she ought not to have been maintaining
we ought not to have been maintaining
you ought not to have been maintaining
they ought not to have been maintaining	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
ought to I maintain?
ought to you maintain?
ought to she maintain?
ought to we maintain?
ought to you maintain?
ought to they maintain? 	ought to I be maintaining?
ought to you be maintaining?
ought to she be maintaining?
ought to we be maintaining?
ought to you be maintaining?
ought to they be maintaining? 	ought to I have maintained?
ought to you have maintained?
ought to she have maintained?
ought to we have maintained?
ought to you have maintained?
ought to they have maintained? 	ought to I have been maintaining?
ought to you have been maintaining?
ought to she have been maintaining?
ought to we have been maintaining?
ought to you have been maintaining?
ought to they have been maintaining? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
ought I not to maintain?
ought you not to maintain?
ought she not to maintain?
ought we not to maintain?
ought you not to maintain?
ought they not to maintain? 	ought I not to be maintaining?
ought you not to be maintaining?
ought she not to be maintaining?
ought we not to be maintaining?
ought you not to be maintaining?
ought they not to be maintaining? 	ought I not to have maintained?
ought you not to have maintained?
ought she not to have maintained?
ought we not to have maintained?
ought you not to have maintained?
ought they not to have maintained? 	ought I not to have been maintaining?
ought you not to have been maintaining?
ought she not to have been maintaining?
ought we not to have been maintaining?
ought you not to have been maintaining?
ought they not to have been maintaining?