must dam
Verbo regular: dam - dammed- dammed

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I must dam
you must dam
she must dam
we must dam
you must dam
they must dam 	I must be damming
you must be damming
she must be damming
we must be damming
you must be damming
they must be damming	I must have dammed
you must have dammed
she must have dammed
we must have dammed
you must have dammed
they must have dammed	I must have been damming
you must have been damming
she must have been damming
we must have been damming
you must have been damming
they must have been damming	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I must not dam
you must not dam
she must not dam
we must not dam
you must not dam
they must not dam 	I must not be damming
you must not be damming
she must not be damming
we must not be damming
you must not be damming
they must not be damming	I must not have dammed
you must not have dammed
she must not have dammed
we must not have dammed
you must not have dammed
they must not have dammed	I must not have been damming
you must not have been damming
she must not have been damming
we must not have been damming
you must not have been damming
they must not have been damming	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
must I dam?
must you dam?
must she dam?
must we dam?
must you dam?
must they dam? 	must I be damming?
must you be damming?
must she be damming?
must we be damming?
must you be damming?
must they be damming? 	must I have dammed?
must you have dammed?
must she have dammed?
must we have dammed?
must you have dammed?
must they have dammed? 	must I have been damming?
must you have been damming?
must she have been damming?
must we have been damming?
must you have been damming?
must they have been damming? 	

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
must I not dam?
must you not dam?
must she not dam?
must we not dam?
must you not dam?
must they not dam? 	must I not be damming?
must you not be damming?
must she not be damming?
must we not be damming?
must you not be damming?
must they not be damming? 	must I not have dammed?
must you not have dammed?
must she not have dammed?
must we not have dammed?
must you not have dammed?
must they not have dammed? 	must I not have been damming?
must you not have been damming?
must she not have been damming?
must we not have been damming?
must you not have been damming?
must they not have been damming?