must attain
Verbo regular: attain - attained- attained

Afirmação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I must attain
you must attain
he must attain
we must attain
you must attain
they must attain 	I must be attaining
you must be attaining
he must be attaining
we must be attaining
you must be attaining
they must be attaining	I must have attained
you must have attained
he must have attained
we must have attained
you must have attained
they must have attained	I must have been attaining
you must have been attaining
he must have been attaining
we must have been attaining
you must have been attaining
they must have been attaining	

Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I must not attain
you must not attain
he must not attain
we must not attain
you must not attain
they must not attain 	I must not be attaining
you must not be attaining
he must not be attaining
we must not be attaining
you must not be attaining
they must not be attaining	I must not have attained
you must not have attained
he must not have attained
we must not have attained
you must not have attained
they must not have attained	I must not have been attaining
you must not have been attaining
he must not have been attaining
we must not have been attaining
you must not have been attaining
they must not have been attaining	

Forma interrogativa 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
must I attain?
must you attain?
must he attain?
must we attain?
must you attain?
must they attain? 	must I be attaining?
must you be attaining?
must he be attaining?
must we be attaining?
must you be attaining?
must they be attaining? 	must I have attained?
must you have attained?
must he have attained?
must we have attained?
must you have attained?
must they have attained? 	must I have been attaining?
must you have been attaining?
must he have been attaining?
must we have been attaining?
must you have been attaining?
must they have been attaining? 	

Forma interro-Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
must I not attain?
must you not attain?
must he not attain?
must we not attain?
must you not attain?
must they not attain? 	must I not be attaining?
must you not be attaining?
must he not be attaining?
must we not be attaining?
must you not be attaining?
must they not be attaining? 	must I not have attained?
must you not have attained?
must he not have attained?
must we not have attained?
must you not have attained?
must they not have attained? 	must I not have been attaining?
must you not have been attaining?
must he not have been attaining?
must we not have been attaining?
must you not have been attaining?
must they not have been attaining?