may substitute
Regular verb: substitute - substituted- substituted

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I may substitute
you may substitute
she may substitute
we may substitute
you may substitute
they may substitute 	I may be substituting
you may be substituting
she may be substituting
we may be substituting
you may be substituting
they may be substituting	I may have substituted
you may have substituted
she may have substituted
we may have substituted
you may have substituted
they may have substituted	I may have been substituting
you may have been substituting
she may have been substituting
we may have been substituting
you may have been substituting
they may have been substituting	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mayn't substitute
you mayn't substitute
she mayn't substitute
we mayn't substitute
you mayn't substitute
they mayn't substitute 	I mayn't be substituting
you mayn't be substituting
she mayn't be substituting
we mayn't be substituting
you mayn't be substituting
they mayn't be substituting	I mayn't have substituted
you mayn't have substituted
she mayn't have substituted
we mayn't have substituted
you mayn't have substituted
they mayn't have substituted	I mayn't have been substituting
you mayn't have been substituting
she mayn't have been substituting
we mayn't have been substituting
you mayn't have been substituting
they mayn't have been substituting	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
may I substitute?
may you substitute?
may she substitute?
may we substitute?
may you substitute?
may they substitute? 	may I be substituting?
may you be substituting?
may she be substituting?
may we be substituting?
may you be substituting?
may they be substituting? 	may I have substituted?
may you have substituted?
may she have substituted?
may we have substituted?
may you have substituted?
may they have substituted? 	may I have been substituting?
may you have been substituting?
may she have been substituting?
may we have been substituting?
may you have been substituting?
may they have been substituting? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mayn't I substitute?
mayn't you substitute?
mayn't she substitute?
mayn't we substitute?
mayn't you substitute?
mayn't they substitute? 	mayn't I be substituting?
mayn't you be substituting?
mayn't she be substituting?
mayn't we be substituting?
mayn't you be substituting?
mayn't they be substituting? 	mayn't I have substituted?
mayn't you have substituted?
mayn't she have substituted?
mayn't we have substituted?
mayn't you have substituted?
mayn't they have substituted? 	mayn't I have been substituting?
mayn't you have been substituting?
mayn't she have been substituting?
mayn't we have been substituting?
mayn't you have been substituting?
mayn't they have been substituting?