must cross
Verbo regular: cross - crossed- crossed

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I must cross
you must cross
she must cross
we must cross
you must cross
they must cross 	I must be crossing
you must be crossing
she must be crossing
we must be crossing
you must be crossing
they must be crossing	I must have crossed
you must have crossed
she must have crossed
we must have crossed
you must have crossed
they must have crossed	I must have been crossing
you must have been crossing
she must have been crossing
we must have been crossing
you must have been crossing
they must have been crossing	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I must not cross
you must not cross
she must not cross
we must not cross
you must not cross
they must not cross 	I must not be crossing
you must not be crossing
she must not be crossing
we must not be crossing
you must not be crossing
they must not be crossing	I must not have crossed
you must not have crossed
she must not have crossed
we must not have crossed
you must not have crossed
they must not have crossed	I must not have been crossing
you must not have been crossing
she must not have been crossing
we must not have been crossing
you must not have been crossing
they must not have been crossing	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
must I cross?
must you cross?
must she cross?
must we cross?
must you cross?
must they cross? 	must I be crossing?
must you be crossing?
must she be crossing?
must we be crossing?
must you be crossing?
must they be crossing? 	must I have crossed?
must you have crossed?
must she have crossed?
must we have crossed?
must you have crossed?
must they have crossed? 	must I have been crossing?
must you have been crossing?
must she have been crossing?
must we have been crossing?
must you have been crossing?
must they have been crossing? 	

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
must I not cross?
must you not cross?
must she not cross?
must we not cross?
must you not cross?
must they not cross? 	must I not be crossing?
must you not be crossing?
must she not be crossing?
must we not be crossing?
must you not be crossing?
must they not be crossing? 	must I not have crossed?
must you not have crossed?
must she not have crossed?
must we not have crossed?
must you not have crossed?
must they not have crossed? 	must I not have been crossing?
must you not have been crossing?
must she not have been crossing?
must we not have been crossing?
must you not have been crossing?
must they not have been crossing?