must acerbate
Verbo regular: acerbate - acerbated- acerbated

Afirmação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I must acerbate
you must acerbate
he must acerbate
we must acerbate
you must acerbate
they must acerbate 	I must be acerbating
you must be acerbating
he must be acerbating
we must be acerbating
you must be acerbating
they must be acerbating	I must have acerbated
you must have acerbated
he must have acerbated
we must have acerbated
you must have acerbated
they must have acerbated	I must have been acerbating
you must have been acerbating
he must have been acerbating
we must have been acerbating
you must have been acerbating
they must have been acerbating	

Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I must not acerbate
you must not acerbate
he must not acerbate
we must not acerbate
you must not acerbate
they must not acerbate 	I must not be acerbating
you must not be acerbating
he must not be acerbating
we must not be acerbating
you must not be acerbating
they must not be acerbating	I must not have acerbated
you must not have acerbated
he must not have acerbated
we must not have acerbated
you must not have acerbated
they must not have acerbated	I must not have been acerbating
you must not have been acerbating
he must not have been acerbating
we must not have been acerbating
you must not have been acerbating
they must not have been acerbating	

Forma interrogativa 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
must I acerbate?
must you acerbate?
must he acerbate?
must we acerbate?
must you acerbate?
must they acerbate? 	must I be acerbating?
must you be acerbating?
must he be acerbating?
must we be acerbating?
must you be acerbating?
must they be acerbating? 	must I have acerbated?
must you have acerbated?
must he have acerbated?
must we have acerbated?
must you have acerbated?
must they have acerbated? 	must I have been acerbating?
must you have been acerbating?
must he have been acerbating?
must we have been acerbating?
must you have been acerbating?
must they have been acerbating? 	

Forma interro-Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
must I not acerbate?
must you not acerbate?
must he not acerbate?
must we not acerbate?
must you not acerbate?
must they not acerbate? 	must I not be acerbating?
must you not be acerbating?
must he not be acerbating?
must we not be acerbating?
must you not be acerbating?
must they not be acerbating? 	must I not have acerbated?
must you not have acerbated?
must he not have acerbated?
must we not have acerbated?
must you not have acerbated?
must they not have acerbated? 	must I not have been acerbating?
must you not have been acerbating?
must he not have been acerbating?
must we not have been acerbating?
must you not have been acerbating?
must they not have been acerbating?