English verb conjugation
MUST CONGRATULATE

Regular verb: congratulate - congratulated - congratulated

Affirmation

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

Negation

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

Interrogative form

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

Interro-negative form

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