must skin
Verbo regular: skin - skinned- skinned

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I must skin
you must skin
he must skin
we must skin
you must skin
they must skin 	I must be skinning
you must be skinning
he must be skinning
we must be skinning
you must be skinning
they must be skinning	I must have skinned
you must have skinned
he must have skinned
we must have skinned
you must have skinned
they must have skinned	I must have been skinning
you must have been skinning
he must have been skinning
we must have been skinning
you must have been skinning
they must have been skinning	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I must not skin
you must not skin
he must not skin
we must not skin
you must not skin
they must not skin 	I must not be skinning
you must not be skinning
he must not be skinning
we must not be skinning
you must not be skinning
they must not be skinning	I must not have skinned
you must not have skinned
he must not have skinned
we must not have skinned
you must not have skinned
they must not have skinned	I must not have been skinning
you must not have been skinning
he must not have been skinning
we must not have been skinning
you must not have been skinning
they must not have been skinning	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
must I skin?
must you skin?
must he skin?
must we skin?
must you skin?
must they skin? 	must I be skinning?
must you be skinning?
must he be skinning?
must we be skinning?
must you be skinning?
must they be skinning? 	must I have skinned?
must you have skinned?
must he have skinned?
must we have skinned?
must you have skinned?
must they have skinned? 	must I have been skinning?
must you have been skinning?
must he have been skinning?
must we have been skinning?
must you have been skinning?
must they have been skinning? 	

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
must I not skin?
must you not skin?
must he not skin?
must we not skin?
must you not skin?
must they not skin? 	must I not be skinning?
must you not be skinning?
must he not be skinning?
must we not be skinning?
must you not be skinning?
must they not be skinning? 	must I not have skinned?
must you not have skinned?
must he not have skinned?
must we not have skinned?
must you not have skinned?
must they not have skinned? 	must I not have been skinning?
must you not have been skinning?
must he not have been skinning?
must we not have been skinning?
must you not have been skinning?
must they not have been skinning?