must skitter
Verbo regular: skitter - skittered- skittered

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I must skitter
you must skitter
he must skitter
we must skitter
you must skitter
they must skitter 	I must be skittering
you must be skittering
he must be skittering
we must be skittering
you must be skittering
they must be skittering	I must have skittered
you must have skittered
he must have skittered
we must have skittered
you must have skittered
they must have skittered	I must have been skittering
you must have been skittering
he must have been skittering
we must have been skittering
you must have been skittering
they must have been skittering	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I must not skitter
you must not skitter
he must not skitter
we must not skitter
you must not skitter
they must not skitter 	I must not be skittering
you must not be skittering
he must not be skittering
we must not be skittering
you must not be skittering
they must not be skittering	I must not have skittered
you must not have skittered
he must not have skittered
we must not have skittered
you must not have skittered
they must not have skittered	I must not have been skittering
you must not have been skittering
he must not have been skittering
we must not have been skittering
you must not have been skittering
they must not have been skittering	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
must I skitter?
must you skitter?
must he skitter?
must we skitter?
must you skitter?
must they skitter? 	must I be skittering?
must you be skittering?
must he be skittering?
must we be skittering?
must you be skittering?
must they be skittering? 	must I have skittered?
must you have skittered?
must he have skittered?
must we have skittered?
must you have skittered?
must they have skittered? 	must I have been skittering?
must you have been skittering?
must he have been skittering?
must we have been skittering?
must you have been skittering?
must they have been skittering? 	

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
must I not skitter?
must you not skitter?
must he not skitter?
must we not skitter?
must you not skitter?
must they not skitter? 	must I not be skittering?
must you not be skittering?
must he not be skittering?
must we not be skittering?
must you not be skittering?
must they not be skittering? 	must I not have skittered?
must you not have skittered?
must he not have skittered?
must we not have skittered?
must you not have skittered?
must they not have skittered? 	must I not have been skittering?
must you not have been skittering?
must he not have been skittering?
must we not have been skittering?
must you not have been skittering?
must they not have been skittering?