I must ail you must ail she must ail we must ail you must ail they must ail
Forma con V-ing
I must be ailing you must be ailing she must be ailing we must be ailing you must be ailing they must be ailing
Perfecto
I must have ailed you must have ailed she must have ailed we must have ailed you must have ailed they must have ailed
Perfecto con V-ing
I must have been ailing you must have been ailing she must have been ailing we must have been ailing you must have been ailing they must have been ailing
Negación
Forma simple
I must not ail you must not ail she must not ail we must not ail you must not ail they must not ail
Forma con V-ing
I must not be ailing you must not be ailing she must not be ailing we must not be ailing you must not be ailing they must not be ailing
Perfecto
I must not have ailed you must not have ailed she must not have ailed we must not have ailed you must not have ailed they must not have ailed
Perfecto con V-ing
I must not have been ailing you must not have been ailing she must not have been ailing we must not have been ailing you must not have been ailing they must not have been ailing
Forma interrogativa
Forma simple
must I ail? must you ail? must she ail? must we ail? must you ail? must they ail?
Forma con V-ing
must I be ailing? must you be ailing? must she be ailing? must we be ailing? must you be ailing? must they be ailing?
Perfecto
must I have ailed? must you have ailed? must she have ailed? must we have ailed? must you have ailed? must they have ailed?
Perfecto con V-ing
must I have been ailing? must you have been ailing? must she have been ailing? must we have been ailing? must you have been ailing? must they have been ailing?
Forma interro-negativa
Forma simple
must I not ail? must you not ail? must she not ail? must we not ail? must you not ail? must they not ail?
Forma con V-ing
must I not be ailing? must you not be ailing? must she not be ailing? must we not be ailing? must you not be ailing? must they not be ailing?
Perfecto
must I not have ailed? must you not have ailed? must she not have ailed? must we not have ailed? must you not have ailed? must they not have ailed?
Perfecto con V-ing
must I not have been ailing? must you not have been ailing? must she not have been ailing? must we not have been ailing? must you not have been ailing? must they not have been ailing?