English verb conjugation
MUST IMPINGE

Regular verb: impinge - impinged - impinged

Affirmation

Simple form	V-ing form
I must impinge you must impinge she must impinge we must impinge you must impinge they must impinge	I must be impinging you must be impinging she must be impinging we must be impinging you must be impinging they must be impinging
Perfect	V-ing perfect
I must have impinged you must have impinged she must have impinged we must have impinged you must have impinged they must have impinged	I must have been impinging you must have been impinging she must have been impinging we must have been impinging you must have been impinging they must have been impinging

Negation

Simple form	V-ing form
I mustn't impinge you mustn't impinge she mustn't impinge we mustn't impinge you mustn't impinge they mustn't impinge	I mustn't be impinging you mustn't be impinging she mustn't be impinging we mustn't be impinging you mustn't be impinging they mustn't be impinging
Perfect	V-ing perfect
I mustn't have impinged you mustn't have impinged she mustn't have impinged we mustn't have impinged you mustn't have impinged they mustn't have impinged	I mustn't have been impinging you mustn't have been impinging she mustn't have been impinging we mustn't have been impinging you mustn't have been impinging they mustn't have been impinging

Interrogative form

Simple form	V-ing form
must I impinge? must you impinge? must she impinge? must we impinge? must you impinge? must they impinge?	must I be impinging? must you be impinging? must she be impinging? must we be impinging? must you be impinging? must they be impinging?
Perfect	V-ing perfect
must I have impinged? must you have impinged? must she have impinged? must we have impinged? must you have impinged? must they have impinged?	must I have been impinging? must you have been impinging? must she have been impinging? must we have been impinging? must you have been impinging? must they have been impinging?

Interro-negative form

Simple form	V-ing form
mustn't I impinge? mustn't you impinge? mustn't she impinge? mustn't we impinge? mustn't you impinge? mustn't they impinge?	mustn't I be impinging? mustn't you be impinging? mustn't she be impinging? mustn't we be impinging? mustn't you be impinging? mustn't they be impinging?
Perfect	V-ing perfect
mustn't I have impinged? mustn't you have impinged? mustn't she have impinged? mustn't we have impinged? mustn't you have impinged? mustn't they have impinged?	mustn't I have been impinging? mustn't you have been impinging? mustn't she have been impinging? mustn't we have been impinging? mustn't you have been impinging? mustn't they have been impinging?