English verb conjugation
MAY SIGN

Regular verb: sign - signed - signed

Affirmation

Simple form	V-ing form
I may sign you may sign he may sign we may sign you may sign they may sign	I may be signing you may be signing he may be signing we may be signing you may be signing they may be signing
Perfect	V-ing perfect
I may have signed you may have signed he may have signed we may have signed you may have signed they may have signed	I may have been signing you may have been signing he may have been signing we may have been signing you may have been signing they may have been signing

Negation

Simple form	V-ing form
I may not sign you may not sign he may not sign we may not sign you may not sign they may not sign	I may not be signing you may not be signing he may not be signing we may not be signing you may not be signing they may not be signing
Perfect	V-ing perfect
I may not have signed you may not have signed he may not have signed we may not have signed you may not have signed they may not have signed	I may not have been signing you may not have been signing he may not have been signing we may not have been signing you may not have been signing they may not have been signing

Interrogative form

Simple form	V-ing form
may I sign? may you sign? may he sign? may we sign? may you sign? may they sign?	may I be signing? may you be signing? may he be signing? may we be signing? may you be signing? may they be signing?
Perfect	V-ing perfect
may I have signed? may you have signed? may he have signed? may we have signed? may you have signed? may they have signed?	may I have been signing? may you have been signing? may he have been signing? may we have been signing? may you have been signing? may they have been signing?

Interro-negative form

Simple form	V-ing form
may I not sign? may you not sign? may he not sign? may we not sign? may you not sign? may they not sign?	may I not be signing? may you not be signing? may he not be signing? may we not be signing? may you not be signing? may they not be signing?
Perfect	V-ing perfect
may I not have signed? may you not have signed? may he not have signed? may we not have signed? may you not have signed? may they not have signed?	may I not have been signing? may you not have been signing? may he not have been signing? may we not have been signing? may you not have been signing? may they not have been signing?