must underachieve
Verbo regular: underachieve - underachieved- underachieved

Afirmação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I must underachieve
you must underachieve
he must underachieve
we must underachieve
you must underachieve
they must underachieve 	I must be underachieving
you must be underachieving
he must be underachieving
we must be underachieving
you must be underachieving
they must be underachieving	I must have underachieved
you must have underachieved
he must have underachieved
we must have underachieved
you must have underachieved
they must have underachieved	I must have been underachieving
you must have been underachieving
he must have been underachieving
we must have been underachieving
you must have been underachieving
they must have been underachieving	

Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I must not underachieve
you must not underachieve
he must not underachieve
we must not underachieve
you must not underachieve
they must not underachieve 	I must not be underachieving
you must not be underachieving
he must not be underachieving
we must not be underachieving
you must not be underachieving
they must not be underachieving	I must not have underachieved
you must not have underachieved
he must not have underachieved
we must not have underachieved
you must not have underachieved
they must not have underachieved	I must not have been underachieving
you must not have been underachieving
he must not have been underachieving
we must not have been underachieving
you must not have been underachieving
they must not have been underachieving	

Forma interrogativa 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
must I underachieve?
must you underachieve?
must he underachieve?
must we underachieve?
must you underachieve?
must they underachieve? 	must I be underachieving?
must you be underachieving?
must he be underachieving?
must we be underachieving?
must you be underachieving?
must they be underachieving? 	must I have underachieved?
must you have underachieved?
must he have underachieved?
must we have underachieved?
must you have underachieved?
must they have underachieved? 	must I have been underachieving?
must you have been underachieving?
must he have been underachieving?
must we have been underachieving?
must you have been underachieving?
must they have been underachieving? 	

Forma interro-Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
must I not underachieve?
must you not underachieve?
must he not underachieve?
must we not underachieve?
must you not underachieve?
must they not underachieve? 	must I not be underachieving?
must you not be underachieving?
must he not be underachieving?
must we not be underachieving?
must you not be underachieving?
must they not be underachieving? 	must I not have underachieved?
must you not have underachieved?
must he not have underachieved?
must we not have underachieved?
must you not have underachieved?
must they not have underachieved? 	must I not have been underachieving?
must you not have been underachieving?
must he not have been underachieving?
must we not have been underachieving?
must you not have been underachieving?
must they not have been underachieving?