may buttress
Regular verb: buttress - buttressed- buttressed

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I may buttress
you may buttress
she may buttress
we may buttress
you may buttress
they may buttress 	I may be buttressing
you may be buttressing
she may be buttressing
we may be buttressing
you may be buttressing
they may be buttressing	I may have buttressed
you may have buttressed
she may have buttressed
we may have buttressed
you may have buttressed
they may have buttressed	I may have been buttressing
you may have been buttressing
she may have been buttressing
we may have been buttressing
you may have been buttressing
they may have been buttressing	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mayn't buttress
you mayn't buttress
she mayn't buttress
we mayn't buttress
you mayn't buttress
they mayn't buttress 	I mayn't be buttressing
you mayn't be buttressing
she mayn't be buttressing
we mayn't be buttressing
you mayn't be buttressing
they mayn't be buttressing	I mayn't have buttressed
you mayn't have buttressed
she mayn't have buttressed
we mayn't have buttressed
you mayn't have buttressed
they mayn't have buttressed	I mayn't have been buttressing
you mayn't have been buttressing
she mayn't have been buttressing
we mayn't have been buttressing
you mayn't have been buttressing
they mayn't have been buttressing	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
may I buttress?
may you buttress?
may she buttress?
may we buttress?
may you buttress?
may they buttress? 	may I be buttressing?
may you be buttressing?
may she be buttressing?
may we be buttressing?
may you be buttressing?
may they be buttressing? 	may I have buttressed?
may you have buttressed?
may she have buttressed?
may we have buttressed?
may you have buttressed?
may they have buttressed? 	may I have been buttressing?
may you have been buttressing?
may she have been buttressing?
may we have been buttressing?
may you have been buttressing?
may they have been buttressing? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mayn't I buttress?
mayn't you buttress?
mayn't she buttress?
mayn't we buttress?
mayn't you buttress?
mayn't they buttress? 	mayn't I be buttressing?
mayn't you be buttressing?
mayn't she be buttressing?
mayn't we be buttressing?
mayn't you be buttressing?
mayn't they be buttressing? 	mayn't I have buttressed?
mayn't you have buttressed?
mayn't she have buttressed?
mayn't we have buttressed?
mayn't you have buttressed?
mayn't they have buttressed? 	mayn't I have been buttressing?
mayn't you have been buttressing?
mayn't she have been buttressing?
mayn't we have been buttressing?
mayn't you have been buttressing?
mayn't they have been buttressing?