must warn
Verbo regular: warn - warned- warned

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I must warn
you must warn
she must warn
we must warn
you must warn
they must warn 	I must be warning
you must be warning
she must be warning
we must be warning
you must be warning
they must be warning	I must have warned
you must have warned
she must have warned
we must have warned
you must have warned
they must have warned	I must have been warning
you must have been warning
she must have been warning
we must have been warning
you must have been warning
they must have been warning	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I must not warn
you must not warn
she must not warn
we must not warn
you must not warn
they must not warn 	I must not be warning
you must not be warning
she must not be warning
we must not be warning
you must not be warning
they must not be warning	I must not have warned
you must not have warned
she must not have warned
we must not have warned
you must not have warned
they must not have warned	I must not have been warning
you must not have been warning
she must not have been warning
we must not have been warning
you must not have been warning
they must not have been warning	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
must I warn?
must you warn?
must she warn?
must we warn?
must you warn?
must they warn? 	must I be warning?
must you be warning?
must she be warning?
must we be warning?
must you be warning?
must they be warning? 	must I have warned?
must you have warned?
must she have warned?
must we have warned?
must you have warned?
must they have warned? 	must I have been warning?
must you have been warning?
must she have been warning?
must we have been warning?
must you have been warning?
must they have been warning? 	

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
must I not warn?
must you not warn?
must she not warn?
must we not warn?
must you not warn?
must they not warn? 	must I not be warning?
must you not be warning?
must she not be warning?
must we not be warning?
must you not be warning?
must they not be warning? 	must I not have warned?
must you not have warned?
must she not have warned?
must we not have warned?
must you not have warned?
must they not have warned? 	must I not have been warning?
must you not have been warning?
must she not have been warning?
must we not have been warning?
must you not have been warning?
must they not have been warning?