ought to ascertain
Verbo regular: ascertain - ascertained- ascertained

Afirmação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I ought to ascertain
you ought to ascertain
he ought to ascertain
we ought to ascertain
you ought to ascertain
they ought to ascertain 	I ought to be ascertaining
you ought to be ascertaining
he ought to be ascertaining
we ought to be ascertaining
you ought to be ascertaining
they ought to be ascertaining	I ought to have ascertained
you ought to have ascertained
he ought to have ascertained
we ought to have ascertained
you ought to have ascertained
they ought to have ascertained	I ought to have been ascertaining
you ought to have been ascertaining
he ought to have been ascertaining
we ought to have been ascertaining
you ought to have been ascertaining
they ought to have been ascertaining	

Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I ought not to ascertain
you ought not to ascertain
he ought not to ascertain
we ought not to ascertain
you ought not to ascertain
they ought not to ascertain 	I ought not to ascertaining
you ought not to ascertaining
he ought not to ascertaining
we ought not to ascertaining
you ought not to ascertaining
they ought not to ascertaining	I ought not to have ascertained
you ought not to have ascertained
he ought not to have ascertained
we ought not to have ascertained
you ought not to have ascertained
they ought not to have ascertained	I ought not to have been ascertaining
you ought not to have been ascertaining
he ought not to have been ascertaining
we ought not to have been ascertaining
you ought not to have been ascertaining
they ought not to have been ascertaining	

Forma interrogativa 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
ought to I ascertain?
ought to you ascertain?
ought to he ascertain?
ought to we ascertain?
ought to you ascertain?
ought to they ascertain? 	ought to I be ascertaining?
ought to you be ascertaining?
ought to he be ascertaining?
ought to we be ascertaining?
ought to you be ascertaining?
ought to they be ascertaining? 	ought to I have ascertained?
ought to you have ascertained?
ought to he have ascertained?
ought to we have ascertained?
ought to you have ascertained?
ought to they have ascertained? 	ought to I have been ascertaining?
ought to you have been ascertaining?
ought to he have been ascertaining?
ought to we have been ascertaining?
ought to you have been ascertaining?
ought to they have been ascertaining? 	

Forma interro-Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
ought I not to ascertain?
ought you not to ascertain?
ought he not to ascertain?
ought we not to ascertain?
ought you not to ascertain?
ought they not to ascertain? 	ought I not to be ascertaining?
ought you not to be ascertaining?
ought he not to be ascertaining?
ought we not to be ascertaining?
ought you not to be ascertaining?
ought they not to be ascertaining? 	ought I not to have ascertained?
ought you not to have ascertained?
ought he not to have ascertained?
ought we not to have ascertained?
ought you not to have ascertained?
ought they not to have ascertained? 	ought I not to have been ascertaining?
ought you not to have been ascertaining?
ought he not to have been ascertaining?
ought we not to have been ascertaining?
ought you not to have been ascertaining?
ought they not to have been ascertaining?