English verb conjugation
MAY CONGRATULATE

Regular verb: congratulate - congratulated - congratulated

Affirmation

Simple form	V-ing form
I may congratulate you may congratulate she may congratulate we may congratulate you may congratulate they may congratulate	I may be congratulating you may be congratulating she may be congratulating we may be congratulating you may be congratulating they may be congratulating
Perfect	V-ing perfect
I may have congratulated you may have congratulated she may have congratulated we may have congratulated you may have congratulated they may have congratulated	I may have been congratulating you may have been congratulating she may have been congratulating we may have been congratulating you may have been congratulating they may have been congratulating

Negation

Simple form	V-ing form
I may not congratulate you may not congratulate she may not congratulate we may not congratulate you may not congratulate they may not congratulate	I may not be congratulating you may not be congratulating she may not be congratulating we may not be congratulating you may not be congratulating they may not be congratulating
Perfect	V-ing perfect
I may not have congratulated you may not have congratulated she may not have congratulated we may not have congratulated you may not have congratulated they may not have congratulated	I may not have been congratulating you may not have been congratulating she may not have been congratulating we may not have been congratulating you may not have been congratulating they may not have been congratulating

Interrogative form

Simple form	V-ing form
may I congratulate? may you congratulate? may she congratulate? may we congratulate? may you congratulate? may they congratulate?	may I be congratulating? may you be congratulating? may she be congratulating? may we be congratulating? may you be congratulating? may they be congratulating?
Perfect	V-ing perfect
may I have congratulated? may you have congratulated? may she have congratulated? may we have congratulated? may you have congratulated? may they have congratulated?	may I have been congratulating? may you have been congratulating? may she have been congratulating? may we have been congratulating? may you have been congratulating? may they have been congratulating?

Interro-negative form

Simple form	V-ing form
may I not congratulate? may you not congratulate? may she not congratulate? may we not congratulate? may you not congratulate? may they not congratulate?	may I not be congratulating? may you not be congratulating? may she not be congratulating? may we not be congratulating? may you not be congratulating? may they not be congratulating?
Perfect	V-ing perfect
may I not have congratulated? may you not have congratulated? may she not have congratulated? may we not have congratulated? may you not have congratulated? may they not have congratulated?	may I not have been congratulating? may you not have been congratulating? may she not have been congratulating? may we not have been congratulating? may you not have been congratulating? may they not have been congratulating?