ought to ventilate
Regular verb: ventilate - ventilated- ventilated

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I ought to ventilate
you ought to ventilate
she ought to ventilate
we ought to ventilate
you ought to ventilate
they ought to ventilate 	I ought to be ventilating
you ought to be ventilating
she ought to be ventilating
we ought to be ventilating
you ought to be ventilating
they ought to be ventilating	I ought to have ventilated
you ought to have ventilated
she ought to have ventilated
we ought to have ventilated
you ought to have ventilated
they ought to have ventilated	I ought to have been ventilating
you ought to have been ventilating
she ought to have been ventilating
we ought to have been ventilating
you ought to have been ventilating
they ought to have been ventilating	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I ought not to ventilate
you ought not to ventilate
she ought not to ventilate
we ought not to ventilate
you ought not to ventilate
they ought not to ventilate 	I ought not to ventilating
you ought not to ventilating
she ought not to ventilating
we ought not to ventilating
you ought not to ventilating
they ought not to ventilating	I ought not to have ventilated
you ought not to have ventilated
she ought not to have ventilated
we ought not to have ventilated
you ought not to have ventilated
they ought not to have ventilated	I ought not to have been ventilating
you ought not to have been ventilating
she ought not to have been ventilating
we ought not to have been ventilating
you ought not to have been ventilating
they ought not to have been ventilating	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
ought to I ventilate?
ought to you ventilate?
ought to she ventilate?
ought to we ventilate?
ought to you ventilate?
ought to they ventilate? 	ought to I be ventilating?
ought to you be ventilating?
ought to she be ventilating?
ought to we be ventilating?
ought to you be ventilating?
ought to they be ventilating? 	ought to I have ventilated?
ought to you have ventilated?
ought to she have ventilated?
ought to we have ventilated?
ought to you have ventilated?
ought to they have ventilated? 	ought to I have been ventilating?
ought to you have been ventilating?
ought to she have been ventilating?
ought to we have been ventilating?
ought to you have been ventilating?
ought to they have been ventilating? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
ought I not to ventilate?
ought you not to ventilate?
ought she not to ventilate?
ought we not to ventilate?
ought you not to ventilate?
ought they not to ventilate? 	ought I not to be ventilating?
ought you not to be ventilating?
ought she not to be ventilating?
ought we not to be ventilating?
ought you not to be ventilating?
ought they not to be ventilating? 	ought I not to have ventilated?
ought you not to have ventilated?
ought she not to have ventilated?
ought we not to have ventilated?
ought you not to have ventilated?
ought they not to have ventilated? 	ought I not to have been ventilating?
ought you not to have been ventilating?
ought she not to have been ventilating?
ought we not to have been ventilating?
ought you not to have been ventilating?
ought they not to have been ventilating?