English verb conjugation
MUST GRATULATE

Regular verb: gratulate - gratulated - gratulated

Affirmation

Simple form	V-ing form
I must gratulate you must gratulate she must gratulate we must gratulate you must gratulate they must gratulate	I must be gratulating you must be gratulating she must be gratulating we must be gratulating you must be gratulating they must be gratulating
Perfect	V-ing perfect
I must have gratulated you must have gratulated she must have gratulated we must have gratulated you must have gratulated they must have gratulated	I must have been gratulating you must have been gratulating she must have been gratulating we must have been gratulating you must have been gratulating they must have been gratulating

Negation

Simple form	V-ing form
I must not gratulate you must not gratulate she must not gratulate we must not gratulate you must not gratulate they must not gratulate	I must not be gratulating you must not be gratulating she must not be gratulating we must not be gratulating you must not be gratulating they must not be gratulating
Perfect	V-ing perfect
I must not have gratulated you must not have gratulated she must not have gratulated we must not have gratulated you must not have gratulated they must not have gratulated	I must not have been gratulating you must not have been gratulating she must not have been gratulating we must not have been gratulating you must not have been gratulating they must not have been gratulating

Interrogative form

Simple form	V-ing form
must I gratulate? must you gratulate? must she gratulate? must we gratulate? must you gratulate? must they gratulate?	must I be gratulating? must you be gratulating? must she be gratulating? must we be gratulating? must you be gratulating? must they be gratulating?
Perfect	V-ing perfect
must I have gratulated? must you have gratulated? must she have gratulated? must we have gratulated? must you have gratulated? must they have gratulated?	must I have been gratulating? must you have been gratulating? must she have been gratulating? must we have been gratulating? must you have been gratulating? must they have been gratulating?

Interro-negative form

Simple form	V-ing form
must I not gratulate? must you not gratulate? must she not gratulate? must we not gratulate? must you not gratulate? must they not gratulate?	must I not be gratulating? must you not be gratulating? must she not be gratulating? must we not be gratulating? must you not be gratulating? must they not be gratulating?
Perfect	V-ing perfect
must I not have gratulated? must you not have gratulated? must she not have gratulated? must we not have gratulated? must you not have gratulated? must they not have gratulated?	must I not have been gratulating? must you not have been gratulating? must she not have been gratulating? must we not have been gratulating? must you not have been gratulating? must they not have been gratulating?