I must skate you must skate he must skate we must skate you must skate they must skate
Forma con V-ing
I must be skating you must be skating he must be skating we must be skating you must be skating they must be skating
Perfecto
I must have skated you must have skated he must have skated we must have skated you must have skated they must have skated
Perfecto con V-ing
I must have been skating you must have been skating he must have been skating we must have been skating you must have been skating they must have been skating
Negación
Forma simple
I must not skate you must not skate he must not skate we must not skate you must not skate they must not skate
Forma con V-ing
I must not be skating you must not be skating he must not be skating we must not be skating you must not be skating they must not be skating
Perfecto
I must not have skated you must not have skated he must not have skated we must not have skated you must not have skated they must not have skated
Perfecto con V-ing
I must not have been skating you must not have been skating he must not have been skating we must not have been skating you must not have been skating they must not have been skating
Forma interrogativa
Forma simple
must I skate? must you skate? must he skate? must we skate? must you skate? must they skate?
Forma con V-ing
must I be skating? must you be skating? must he be skating? must we be skating? must you be skating? must they be skating?
Perfecto
must I have skated? must you have skated? must he have skated? must we have skated? must you have skated? must they have skated?
Perfecto con V-ing
must I have been skating? must you have been skating? must he have been skating? must we have been skating? must you have been skating? must they have been skating?
Forma interro-negativa
Forma simple
must I not skate? must you not skate? must he not skate? must we not skate? must you not skate? must they not skate?
Forma con V-ing
must I not be skating? must you not be skating? must he not be skating? must we not be skating? must you not be skating? must they not be skating?
Perfecto
must I not have skated? must you not have skated? must he not have skated? must we not have skated? must you not have skated? must they not have skated?
Perfecto con V-ing
must I not have been skating? must you not have been skating? must he not have been skating? must we not have been skating? must you not have been skating? must they not have been skating?