I must impinge you must impinge she must impinge we must impinge you must impinge they must impinge
V-ing form
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
I must have impinged you must have impinged she must have impinged we must have impinged you must have impinged they must have impinged
V-ing perfect
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
I must not impinge you must not impinge she must not impinge we must not impinge you must not impinge they must not impinge
V-ing form
I must not be impinging you must not be impinging she must not be impinging we must not be impinging you must not be impinging they must not be impinging
Perfect
I must not have impinged you must not have impinged she must not have impinged we must not have impinged you must not have impinged they must not have impinged
V-ing perfect
I must not have been impinging you must not have been impinging she must not have been impinging we must not have been impinging you must not have been impinging they must not have been impinging
Interrogative form
Simple form
must I impinge? must you impinge? must she impinge? must we impinge? must you impinge? must they impinge?
V-ing form
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
must I have impinged? must you have impinged? must she have impinged? must we have impinged? must you have impinged? must they have impinged?
V-ing perfect
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
must I not impinge? must you not impinge? must she not impinge? must we not impinge? must you not impinge? must they not impinge?
V-ing form
must I not be impinging? must you not be impinging? must she not be impinging? must we not be impinging? must you not be impinging? must they not be impinging?
Perfect
must I not have impinged? must you not have impinged? must she not have impinged? must we not have impinged? must you not have impinged? must they not have impinged?
V-ing perfect
must I not have been impinging? must you not have been impinging? must she not have been impinging? must we not have been impinging? must you not have been impinging? must they not have been impinging?