must derail
Verbo regular: derail - derailed- derailed

Afirmação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I must derail
you must derail
he must derail
we must derail
you must derail
they must derail 	I must be derailing
you must be derailing
he must be derailing
we must be derailing
you must be derailing
they must be derailing	I must have derailed
you must have derailed
he must have derailed
we must have derailed
you must have derailed
they must have derailed	I must have been derailing
you must have been derailing
he must have been derailing
we must have been derailing
you must have been derailing
they must have been derailing	

Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I must not derail
you must not derail
he must not derail
we must not derail
you must not derail
they must not derail 	I must not be derailing
you must not be derailing
he must not be derailing
we must not be derailing
you must not be derailing
they must not be derailing	I must not have derailed
you must not have derailed
he must not have derailed
we must not have derailed
you must not have derailed
they must not have derailed	I must not have been derailing
you must not have been derailing
he must not have been derailing
we must not have been derailing
you must not have been derailing
they must not have been derailing	

Forma interrogativa 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
must I derail?
must you derail?
must he derail?
must we derail?
must you derail?
must they derail? 	must I be derailing?
must you be derailing?
must he be derailing?
must we be derailing?
must you be derailing?
must they be derailing? 	must I have derailed?
must you have derailed?
must he have derailed?
must we have derailed?
must you have derailed?
must they have derailed? 	must I have been derailing?
must you have been derailing?
must he have been derailing?
must we have been derailing?
must you have been derailing?
must they have been derailing? 	

Forma interro-Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
must I not derail?
must you not derail?
must he not derail?
must we not derail?
must you not derail?
must they not derail? 	must I not be derailing?
must you not be derailing?
must he not be derailing?
must we not be derailing?
must you not be derailing?
must they not be derailing? 	must I not have derailed?
must you not have derailed?
must he not have derailed?
must we not have derailed?
must you not have derailed?
must they not have derailed? 	must I not have been derailing?
must you not have been derailing?
must he not have been derailing?
must we not have been derailing?
must you not have been derailing?
must they not have been derailing?