I must fasten you must fasten she must fasten we must fasten you must fasten they must fasten
Forma con V-ing
I must be fastening you must be fastening she must be fastening we must be fastening you must be fastening they must be fastening
Perfecto
I must have fastened you must have fastened she must have fastened we must have fastened you must have fastened they must have fastened
Perfecto con V-ing
I must have been fastening you must have been fastening she must have been fastening we must have been fastening you must have been fastening they must have been fastening
Negación
Forma simple
I must not fasten you must not fasten she must not fasten we must not fasten you must not fasten they must not fasten
Forma con V-ing
I must not be fastening you must not be fastening she must not be fastening we must not be fastening you must not be fastening they must not be fastening
Perfecto
I must not have fastened you must not have fastened she must not have fastened we must not have fastened you must not have fastened they must not have fastened
Perfecto con V-ing
I must not have been fastening you must not have been fastening she must not have been fastening we must not have been fastening you must not have been fastening they must not have been fastening
Forma interrogativa
Forma simple
must I fasten? must you fasten? must she fasten? must we fasten? must you fasten? must they fasten?
Forma con V-ing
must I be fastening? must you be fastening? must she be fastening? must we be fastening? must you be fastening? must they be fastening?
Perfecto
must I have fastened? must you have fastened? must she have fastened? must we have fastened? must you have fastened? must they have fastened?
Perfecto con V-ing
must I have been fastening? must you have been fastening? must she have been fastening? must we have been fastening? must you have been fastening? must they have been fastening?
Forma interro-negativa
Forma simple
must I not fasten? must you not fasten? must she not fasten? must we not fasten? must you not fasten? must they not fasten?
Forma con V-ing
must I not be fastening? must you not be fastening? must she not be fastening? must we not be fastening? must you not be fastening? must they not be fastening?
Perfecto
must I not have fastened? must you not have fastened? must she not have fastened? must we not have fastened? must you not have fastened? must they not have fastened?
Perfecto con V-ing
must I not have been fastening? must you not have been fastening? must she not have been fastening? must we not have been fastening? must you not have been fastening? must they not have been fastening?