English verb conjugation
MUST STRING

Irregular verb: string - strung - strung

Affirmation

Simple form	V-ing form
I must string you must string he must string we must string you must string they must string	I must be stringing you must be stringing he must be stringing we must be stringing you must be stringing they must be stringing
Perfect	V-ing perfect
I must have strung you must have strung he must have strung we must have strung you must have strung they must have strung	I must have been stringing you must have been stringing he must have been stringing we must have been stringing you must have been stringing they must have been stringing

Negation

Simple form	V-ing form
I must not string you must not string he must not string we must not string you must not string they must not string	I must not be stringing you must not be stringing he must not be stringing we must not be stringing you must not be stringing they must not be stringing
Perfect	V-ing perfect
I must not have strung you must not have strung he must not have strung we must not have strung you must not have strung they must not have strung	I must not have been stringing you must not have been stringing he must not have been stringing we must not have been stringing you must not have been stringing they must not have been stringing

Interrogative form

Simple form	V-ing form
must I string? must you string? must he string? must we string? must you string? must they string?	must I be stringing? must you be stringing? must he be stringing? must we be stringing? must you be stringing? must they be stringing?
Perfect	V-ing perfect
must I have strung? must you have strung? must he have strung? must we have strung? must you have strung? must they have strung?	must I have been stringing? must you have been stringing? must he have been stringing? must we have been stringing? must you have been stringing? must they have been stringing?

Interro-negative form

Simple form	V-ing form
must I not string? must you not string? must he not string? must we not string? must you not string? must they not string?	must I not be stringing? must you not be stringing? must he not be stringing? must we not be stringing? must you not be stringing? must they not be stringing?
Perfect	V-ing perfect
must I not have strung? must you not have strung? must he not have strung? must we not have strung? must you not have strung? must they not have strung?	must I not have been stringing? must you not have been stringing? must he not have been stringing? must we not have been stringing? must you not have been stringing? must they not have been stringing?