I must frost you must frost she must frost we must frost you must frost they must frost
Forma con V-ing
I must be frosting you must be frosting she must be frosting we must be frosting you must be frosting they must be frosting
Perfecto
I must have frosted you must have frosted she must have frosted we must have frosted you must have frosted they must have frosted
Perfecto con V-ing
I must have been frosting you must have been frosting she must have been frosting we must have been frosting you must have been frosting they must have been frosting
Negación
Forma simple
I must not frost you must not frost she must not frost we must not frost you must not frost they must not frost
Forma con V-ing
I must not be frosting you must not be frosting she must not be frosting we must not be frosting you must not be frosting they must not be frosting
Perfecto
I must not have frosted you must not have frosted she must not have frosted we must not have frosted you must not have frosted they must not have frosted
Perfecto con V-ing
I must not have been frosting you must not have been frosting she must not have been frosting we must not have been frosting you must not have been frosting they must not have been frosting
Forma interrogativa
Forma simple
must I frost? must you frost? must she frost? must we frost? must you frost? must they frost?
Forma con V-ing
must I be frosting? must you be frosting? must she be frosting? must we be frosting? must you be frosting? must they be frosting?
Perfecto
must I have frosted? must you have frosted? must she have frosted? must we have frosted? must you have frosted? must they have frosted?
Perfecto con V-ing
must I have been frosting? must you have been frosting? must she have been frosting? must we have been frosting? must you have been frosting? must they have been frosting?
Forma interro-negativa
Forma simple
must I not frost? must you not frost? must she not frost? must we not frost? must you not frost? must they not frost?
Forma con V-ing
must I not be frosting? must you not be frosting? must she not be frosting? must we not be frosting? must you not be frosting? must they not be frosting?
Perfecto
must I not have frosted? must you not have frosted? must she not have frosted? must we not have frosted? must you not have frosted? must they not have frosted?
Perfecto con V-ing
must I not have been frosting? must you not have been frosting? must she not have been frosting? must we not have been frosting? must you not have been frosting? must they not have been frosting?