may ventilate
Regular verb: ventilate - ventilated- ventilated

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I may ventilate
you may ventilate
he may ventilate
we may ventilate
you may ventilate
they may ventilate 	I may be ventilating
you may be ventilating
he may be ventilating
we may be ventilating
you may be ventilating
they may be ventilating	I may have ventilated
you may have ventilated
he may have ventilated
we may have ventilated
you may have ventilated
they may have ventilated	I may have been ventilating
you may have been ventilating
he may have been ventilating
we may have been ventilating
you may have been ventilating
they may have been ventilating	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mayn't ventilate
you mayn't ventilate
he mayn't ventilate
we mayn't ventilate
you mayn't ventilate
they mayn't ventilate 	I mayn't be ventilating
you mayn't be ventilating
he mayn't be ventilating
we mayn't be ventilating
you mayn't be ventilating
they mayn't be ventilating	I mayn't have ventilated
you mayn't have ventilated
he mayn't have ventilated
we mayn't have ventilated
you mayn't have ventilated
they mayn't have ventilated	I mayn't have been ventilating
you mayn't have been ventilating
he mayn't have been ventilating
we mayn't have been ventilating
you mayn't have been ventilating
they mayn't have been ventilating	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
may I ventilate?
may you ventilate?
may he ventilate?
may we ventilate?
may you ventilate?
may they ventilate? 	may I be ventilating?
may you be ventilating?
may he be ventilating?
may we be ventilating?
may you be ventilating?
may they be ventilating? 	may I have ventilated?
may you have ventilated?
may he have ventilated?
may we have ventilated?
may you have ventilated?
may they have ventilated? 	may I have been ventilating?
may you have been ventilating?
may he have been ventilating?
may we have been ventilating?
may you have been ventilating?
may they have been ventilating? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mayn't I ventilate?
mayn't you ventilate?
mayn't he ventilate?
mayn't we ventilate?
mayn't you ventilate?
mayn't they ventilate? 	mayn't I be ventilating?
mayn't you be ventilating?
mayn't he be ventilating?
mayn't we be ventilating?
mayn't you be ventilating?
mayn't they be ventilating? 	mayn't I have ventilated?
mayn't you have ventilated?
mayn't he have ventilated?
mayn't we have ventilated?
mayn't you have ventilated?
mayn't they have ventilated? 	mayn't I have been ventilating?
mayn't you have been ventilating?
mayn't he have been ventilating?
mayn't we have been ventilating?
mayn't you have been ventilating?
mayn't they have been ventilating?