I must whistle you must whistle she must whistle we must whistle you must whistle they must whistle
Forma con V-ing
I must be whistling you must be whistling she must be whistling we must be whistling you must be whistling they must be whistling
Perfecto
I must have whistled you must have whistled she must have whistled we must have whistled you must have whistled they must have whistled
Perfecto con V-ing
I must have been whistling you must have been whistling she must have been whistling we must have been whistling you must have been whistling they must have been whistling
Negación
Forma simple
I must not whistle you must not whistle she must not whistle we must not whistle you must not whistle they must not whistle
Forma con V-ing
I must not be whistling you must not be whistling she must not be whistling we must not be whistling you must not be whistling they must not be whistling
Perfecto
I must not have whistled you must not have whistled she must not have whistled we must not have whistled you must not have whistled they must not have whistled
Perfecto con V-ing
I must not have been whistling you must not have been whistling she must not have been whistling we must not have been whistling you must not have been whistling they must not have been whistling
Forma interrogativa
Forma simple
must I whistle? must you whistle? must she whistle? must we whistle? must you whistle? must they whistle?
Forma con V-ing
must I be whistling? must you be whistling? must she be whistling? must we be whistling? must you be whistling? must they be whistling?
Perfecto
must I have whistled? must you have whistled? must she have whistled? must we have whistled? must you have whistled? must they have whistled?
Perfecto con V-ing
must I have been whistling? must you have been whistling? must she have been whistling? must we have been whistling? must you have been whistling? must they have been whistling?
Forma interro-negativa
Forma simple
must I not whistle? must you not whistle? must she not whistle? must we not whistle? must you not whistle? must they not whistle?
Forma con V-ing
must I not be whistling? must you not be whistling? must she not be whistling? must we not be whistling? must you not be whistling? must they not be whistling?
Perfecto
must I not have whistled? must you not have whistled? must she not have whistled? must we not have whistled? must you not have whistled? must they not have whistled?
Perfecto con V-ing
must I not have been whistling? must you not have been whistling? must she not have been whistling? must we not have been whistling? must you not have been whistling? must they not have been whistling?