must string
Verbo irregular: string - strung- strung

Afirmação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
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	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	

Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
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	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	

Forma interrogativa 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
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? 	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? 	

Forma interro-Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
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? 	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?