must tail
Verbo regular: tail - tailed- tailed

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I must tail
you must tail
he must tail
we must tail
you must tail
they must tail 	I must be tailing
you must be tailing
he must be tailing
we must be tailing
you must be tailing
they must be tailing	I must have tailed
you must have tailed
he must have tailed
we must have tailed
you must have tailed
they must have tailed	I must have been tailing
you must have been tailing
he must have been tailing
we must have been tailing
you must have been tailing
they must have been tailing	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I must not tail
you must not tail
he must not tail
we must not tail
you must not tail
they must not tail 	I must not be tailing
you must not be tailing
he must not be tailing
we must not be tailing
you must not be tailing
they must not be tailing	I must not have tailed
you must not have tailed
he must not have tailed
we must not have tailed
you must not have tailed
they must not have tailed	I must not have been tailing
you must not have been tailing
he must not have been tailing
we must not have been tailing
you must not have been tailing
they must not have been tailing	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
must I tail?
must you tail?
must he tail?
must we tail?
must you tail?
must they tail? 	must I be tailing?
must you be tailing?
must he be tailing?
must we be tailing?
must you be tailing?
must they be tailing? 	must I have tailed?
must you have tailed?
must he have tailed?
must we have tailed?
must you have tailed?
must they have tailed? 	must I have been tailing?
must you have been tailing?
must he have been tailing?
must we have been tailing?
must you have been tailing?
must they have been tailing? 	

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
must I not tail?
must you not tail?
must he not tail?
must we not tail?
must you not tail?
must they not tail? 	must I not be tailing?
must you not be tailing?
must he not be tailing?
must we not be tailing?
must you not be tailing?
must they not be tailing? 	must I not have tailed?
must you not have tailed?
must he not have tailed?
must we not have tailed?
must you not have tailed?
must they not have tailed? 	must I not have been tailing?
must you not have been tailing?
must he not have been tailing?
must we not have been tailing?
must you not have been tailing?
must they not have been tailing?