must dam
Verbo regular: dam - dammed- dammed

Afirmação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I must dam
you must dam
he must dam
we must dam
you must dam
they must dam 	I must be damming
you must be damming
he must be damming
we must be damming
you must be damming
they must be damming	I must have dammed
you must have dammed
he 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
he must have been damming
we must have been damming
you must have been damming
they must have been damming	

Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I must not dam
you must not dam
he 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
he 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
he 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
he 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 com V-ing 	Perfeito 	Perfeito com V-ing 	
must I dam?
must you dam?
must he dam?
must we dam?
must you dam?
must they dam? 	must I be damming?
must you be damming?
must he be damming?
must we be damming?
must you be damming?
must they be damming? 	must I have dammed?
must you have dammed?
must he 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 he have been damming?
must we have been damming?
must you have been damming?
must they have been damming? 	

Forma interro-Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
must I not dam?
must you not dam?
must he 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 he 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 he 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 he not have been damming?
must we not have been damming?
must you not have been damming?
must they not have been damming?