may deteriorate
Regular verb: deteriorate - deteriorated- deteriorated

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I may deteriorate
you may deteriorate
she may deteriorate
we may deteriorate
you may deteriorate
they may deteriorate 	I may be deteriorating
you may be deteriorating
she may be deteriorating
we may be deteriorating
you may be deteriorating
they may be deteriorating	I may have deteriorated
you may have deteriorated
she may have deteriorated
we may have deteriorated
you may have deteriorated
they may have deteriorated	I may have been deteriorating
you may have been deteriorating
she may have been deteriorating
we may have been deteriorating
you may have been deteriorating
they may have been deteriorating	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mayn't deteriorate
you mayn't deteriorate
she mayn't deteriorate
we mayn't deteriorate
you mayn't deteriorate
they mayn't deteriorate 	I mayn't be deteriorating
you mayn't be deteriorating
she mayn't be deteriorating
we mayn't be deteriorating
you mayn't be deteriorating
they mayn't be deteriorating	I mayn't have deteriorated
you mayn't have deteriorated
she mayn't have deteriorated
we mayn't have deteriorated
you mayn't have deteriorated
they mayn't have deteriorated	I mayn't have been deteriorating
you mayn't have been deteriorating
she mayn't have been deteriorating
we mayn't have been deteriorating
you mayn't have been deteriorating
they mayn't have been deteriorating	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
may I deteriorate?
may you deteriorate?
may she deteriorate?
may we deteriorate?
may you deteriorate?
may they deteriorate? 	may I be deteriorating?
may you be deteriorating?
may she be deteriorating?
may we be deteriorating?
may you be deteriorating?
may they be deteriorating? 	may I have deteriorated?
may you have deteriorated?
may she have deteriorated?
may we have deteriorated?
may you have deteriorated?
may they have deteriorated? 	may I have been deteriorating?
may you have been deteriorating?
may she have been deteriorating?
may we have been deteriorating?
may you have been deteriorating?
may they have been deteriorating? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mayn't I deteriorate?
mayn't you deteriorate?
mayn't she deteriorate?
mayn't we deteriorate?
mayn't you deteriorate?
mayn't they deteriorate? 	mayn't I be deteriorating?
mayn't you be deteriorating?
mayn't she be deteriorating?
mayn't we be deteriorating?
mayn't you be deteriorating?
mayn't they be deteriorating? 	mayn't I have deteriorated?
mayn't you have deteriorated?
mayn't she have deteriorated?
mayn't we have deteriorated?
mayn't you have deteriorated?
mayn't they have deteriorated? 	mayn't I have been deteriorating?
mayn't you have been deteriorating?
mayn't she have been deteriorating?
mayn't we have been deteriorating?
mayn't you have been deteriorating?
mayn't they have been deteriorating?