English verb conjugation
MUST DAM

Regular verb: dam - dammed - dammed

Affirmation

Simple form	V-ing form
I must dam you must dam he must dam we must dam you must dam they must dam	I must be damming you must be damming he must be damming we must be damming you must be damming they must be damming
Perfect	V-ing perfect
I must have dammed you must have dammed he must have dammed we must have dammed you must have dammed they must have dammed	I must have been damming you must have been damming he must have been damming we must have been damming you must have been damming they must have been damming

Negation

Simple form	V-ing form
I must not dam you must not dam he must not dam we must not dam you must not dam they must not dam	I must not be damming you must not be damming he must not be damming we must not be damming you must not be damming they must not be damming
Perfect	V-ing perfect
I must not have dammed you must not have dammed he must not have dammed we must not have dammed you must not have dammed they must not have dammed	I must not have been damming you must not have been damming he must not have been damming we must not have been damming you must not have been damming they must not have been damming

Interrogative form

Simple form	V-ing form
must I dam? must you dam? must he dam? must we dam? must you dam? must they dam?	must I be damming? must you be damming? must he be damming? must we be damming? must you be damming? must they be damming?
Perfect	V-ing perfect
must I have dammed? must you have dammed? must he have dammed? must we have dammed? must you have dammed? must they have dammed?	must I have been damming? must you have been damming? must he have been damming? must we have been damming? must you have been damming? must they have been damming?

Interro-negative form

Simple form	V-ing form
must I not dam? must you not dam? must he not dam? must we not dam? must you not dam? must they not dam?	must I not be damming? must you not be damming? must he not be damming? must we not be damming? must you not be damming? must they not be damming?
Perfect	V-ing perfect
must I not have dammed? must you not have dammed? must he not have dammed? must we not have dammed? must you not have dammed? must they not have dammed?	must I not have been damming? must you not have been damming? must he not have been damming? must we not have been damming? must you not have been damming? must they not have been damming?