I must prevent you must prevent she must prevent we must prevent you must prevent they must prevent
Forma con V-ing
I must be preventing you must be preventing she must be preventing we must be preventing you must be preventing they must be preventing
Perfecto
I must have prevented you must have prevented she must have prevented we must have prevented you must have prevented they must have prevented
Perfecto con V-ing
I must have been preventing you must have been preventing she must have been preventing we must have been preventing you must have been preventing they must have been preventing
Negación
Forma simple
I must not prevent you must not prevent she must not prevent we must not prevent you must not prevent they must not prevent
Forma con V-ing
I must not be preventing you must not be preventing she must not be preventing we must not be preventing you must not be preventing they must not be preventing
Perfecto
I must not have prevented you must not have prevented she must not have prevented we must not have prevented you must not have prevented they must not have prevented
Perfecto con V-ing
I must not have been preventing you must not have been preventing she must not have been preventing we must not have been preventing you must not have been preventing they must not have been preventing
Forma interrogativa
Forma simple
must I prevent? must you prevent? must she prevent? must we prevent? must you prevent? must they prevent?
Forma con V-ing
must I be preventing? must you be preventing? must she be preventing? must we be preventing? must you be preventing? must they be preventing?
Perfecto
must I have prevented? must you have prevented? must she have prevented? must we have prevented? must you have prevented? must they have prevented?
Perfecto con V-ing
must I have been preventing? must you have been preventing? must she have been preventing? must we have been preventing? must you have been preventing? must they have been preventing?
Forma interro-negativa
Forma simple
must I not prevent? must you not prevent? must she not prevent? must we not prevent? must you not prevent? must they not prevent?
Forma con V-ing
must I not be preventing? must you not be preventing? must she not be preventing? must we not be preventing? must you not be preventing? must they not be preventing?
Perfecto
must I not have prevented? must you not have prevented? must she not have prevented? must we not have prevented? must you not have prevented? must they not have prevented?
Perfecto con V-ing
must I not have been preventing? must you not have been preventing? must she not have been preventing? must we not have been preventing? must you not have been preventing? must they not have been preventing?