English verb conjugation
MUST IMPRESS

Regular verb: impress - impressed - impressed

Affirmation

Simple form	V-ing form
I must impress you must impress he must impress we must impress you must impress they must impress	I must be impressing you must be impressing he must be impressing we must be impressing you must be impressing they must be impressing
Perfect	V-ing perfect
I must have impressed you must have impressed he must have impressed we must have impressed you must have impressed they must have impressed	I must have been impressing you must have been impressing he must have been impressing we must have been impressing you must have been impressing they must have been impressing

Negation

Simple form	V-ing form
I mustn't impress you mustn't impress he mustn't impress we mustn't impress you mustn't impress they mustn't impress	I mustn't be impressing you mustn't be impressing he mustn't be impressing we mustn't be impressing you mustn't be impressing they mustn't be impressing
Perfect	V-ing perfect
I mustn't have impressed you mustn't have impressed he mustn't have impressed we mustn't have impressed you mustn't have impressed they mustn't have impressed	I mustn't have been impressing you mustn't have been impressing he mustn't have been impressing we mustn't have been impressing you mustn't have been impressing they mustn't have been impressing

Interrogative form

Simple form	V-ing form
must I impress? must you impress? must he impress? must we impress? must you impress? must they impress?	must I be impressing? must you be impressing? must he be impressing? must we be impressing? must you be impressing? must they be impressing?
Perfect	V-ing perfect
must I have impressed? must you have impressed? must he have impressed? must we have impressed? must you have impressed? must they have impressed?	must I have been impressing? must you have been impressing? must he have been impressing? must we have been impressing? must you have been impressing? must they have been impressing?

Interro-negative form

Simple form	V-ing form
mustn't I impress? mustn't you impress? mustn't he impress? mustn't we impress? mustn't you impress? mustn't they impress?	mustn't I be impressing? mustn't you be impressing? mustn't he be impressing? mustn't we be impressing? mustn't you be impressing? mustn't they be impressing?
Perfect	V-ing perfect
mustn't I have impressed? mustn't you have impressed? mustn't he have impressed? mustn't we have impressed? mustn't you have impressed? mustn't they have impressed?	mustn't I have been impressing? mustn't you have been impressing? mustn't he have been impressing? mustn't we have been impressing? mustn't you have been impressing? mustn't they have been impressing?