ought to stain
Regular verb: stain - stained- stained

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I ought to stain
you ought to stain
she ought to stain
we ought to stain
you ought to stain
they ought to stain 	I ought to be staining
you ought to be staining
she ought to be staining
we ought to be staining
you ought to be staining
they ought to be staining	I ought to have stained
you ought to have stained
she ought to have stained
we ought to have stained
you ought to have stained
they ought to have stained	I ought to have been staining
you ought to have been staining
she ought to have been staining
we ought to have been staining
you ought to have been staining
they ought to have been staining	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I ought not to stain
you ought not to stain
she ought not to stain
we ought not to stain
you ought not to stain
they ought not to stain 	I ought not to staining
you ought not to staining
she ought not to staining
we ought not to staining
you ought not to staining
they ought not to staining	I ought not to have stained
you ought not to have stained
she ought not to have stained
we ought not to have stained
you ought not to have stained
they ought not to have stained	I ought not to have been staining
you ought not to have been staining
she ought not to have been staining
we ought not to have been staining
you ought not to have been staining
they ought not to have been staining	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
ought to I stain?
ought to you stain?
ought to she stain?
ought to we stain?
ought to you stain?
ought to they stain? 	ought to I be staining?
ought to you be staining?
ought to she be staining?
ought to we be staining?
ought to you be staining?
ought to they be staining? 	ought to I have stained?
ought to you have stained?
ought to she have stained?
ought to we have stained?
ought to you have stained?
ought to they have stained? 	ought to I have been staining?
ought to you have been staining?
ought to she have been staining?
ought to we have been staining?
ought to you have been staining?
ought to they have been staining? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
ought I not to stain?
ought you not to stain?
ought she not to stain?
ought we not to stain?
ought you not to stain?
ought they not to stain? 	ought I not to be staining?
ought you not to be staining?
ought she not to be staining?
ought we not to be staining?
ought you not to be staining?
ought they not to be staining? 	ought I not to have stained?
ought you not to have stained?
ought she not to have stained?
ought we not to have stained?
ought you not to have stained?
ought they not to have stained? 	ought I not to have been staining?
ought you not to have been staining?
ought she not to have been staining?
ought we not to have been staining?
ought you not to have been staining?
ought they not to have been staining?