Conjugación del verbo inglés
MUST REFER

Verbo regular: refer - referred - referred

Afirmación

Forma simple	Forma con V-ing
I must refer you must refer she must refer we must refer you must refer they must refer	I must be referring you must be referring she must be referring we must be referring you must be referring they must be referring
Perfecto	Perfecto con V-ing
I must have referred you must have referred she must have referred we must have referred you must have referred they must have referred	I must have been referring you must have been referring she must have been referring we must have been referring you must have been referring they must have been referring

Negación

Forma simple	Forma con V-ing
I must not refer you must not refer she must not refer we must not refer you must not refer they must not refer	I must not be referring you must not be referring she must not be referring we must not be referring you must not be referring they must not be referring
Perfecto	Perfecto con V-ing
I must not have referred you must not have referred she must not have referred we must not have referred you must not have referred they must not have referred	I must not have been referring you must not have been referring she must not have been referring we must not have been referring you must not have been referring they must not have been referring

Forma interrogativa

Forma simple	Forma con V-ing
must I refer? must you refer? must she refer? must we refer? must you refer? must they refer?	must I be referring? must you be referring? must she be referring? must we be referring? must you be referring? must they be referring?
Perfecto	Perfecto con V-ing
must I have referred? must you have referred? must she have referred? must we have referred? must you have referred? must they have referred?	must I have been referring? must you have been referring? must she have been referring? must we have been referring? must you have been referring? must they have been referring?

Forma interro-negativa

Forma simple	Forma con V-ing
must I not refer? must you not refer? must she not refer? must we not refer? must you not refer? must they not refer?	must I not be referring? must you not be referring? must she not be referring? must we not be referring? must you not be referring? must they not be referring?
Perfecto	Perfecto con V-ing
must I not have referred? must you not have referred? must she not have referred? must we not have referred? must you not have referred? must they not have referred?	must I not have been referring? must you not have been referring? must she not have been referring? must we not have been referring? must you not have been referring? must they not have been referring?