I must sharpen you must sharpen he must sharpen we must sharpen you must sharpen they must sharpen
Forma con V-ing
I must be sharpening you must be sharpening he must be sharpening we must be sharpening you must be sharpening they must be sharpening
Perfecto
I must have sharpened you must have sharpened he must have sharpened we must have sharpened you must have sharpened they must have sharpened
Perfecto con V-ing
I must have been sharpening you must have been sharpening he must have been sharpening we must have been sharpening you must have been sharpening they must have been sharpening
Negación
Forma simple
I mustn't sharpen you mustn't sharpen he mustn't sharpen we mustn't sharpen you mustn't sharpen they mustn't sharpen
Forma con V-ing
I mustn't be sharpening you mustn't be sharpening he mustn't be sharpening we mustn't be sharpening you mustn't be sharpening they mustn't be sharpening
Perfecto
I mustn't have sharpened you mustn't have sharpened he mustn't have sharpened we mustn't have sharpened you mustn't have sharpened they mustn't have sharpened
Perfecto con V-ing
I mustn't have been sharpening you mustn't have been sharpening he mustn't have been sharpening we mustn't have been sharpening you mustn't have been sharpening they mustn't have been sharpening
Forma interrogativa
Forma simple
must I sharpen? must you sharpen? must he sharpen? must we sharpen? must you sharpen? must they sharpen?
Forma con V-ing
must I be sharpening? must you be sharpening? must he be sharpening? must we be sharpening? must you be sharpening? must they be sharpening?
Perfecto
must I have sharpened? must you have sharpened? must he have sharpened? must we have sharpened? must you have sharpened? must they have sharpened?
Perfecto con V-ing
must I have been sharpening? must you have been sharpening? must he have been sharpening? must we have been sharpening? must you have been sharpening? must they have been sharpening?
Forma interro-negativa
Forma simple
mustn't I sharpen? mustn't you sharpen? mustn't he sharpen? mustn't we sharpen? mustn't you sharpen? mustn't they sharpen?
Forma con V-ing
mustn't I be sharpening? mustn't you be sharpening? mustn't he be sharpening? mustn't we be sharpening? mustn't you be sharpening? mustn't they be sharpening?
Perfecto
mustn't I have sharpened? mustn't you have sharpened? mustn't he have sharpened? mustn't we have sharpened? mustn't you have sharpened? mustn't they have sharpened?
Perfecto con V-ing
mustn't I have been sharpening? mustn't you have been sharpening? mustn't he have been sharpening? mustn't we have been sharpening? mustn't you have been sharpening? mustn't they have been sharpening?