can preascertain
Verbo regular: preascertain - preascertained- preascertained

Afirmação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I can preascertain
you can preascertain
he can preascertain
we can preascertain
you can preascertain
they can preascertain 	I can be preascertaining
you can be preascertaining
he can be preascertaining
we can be preascertaining
you can be preascertaining
they can be preascertaining	I can have preascertained
you can have preascertained
he can have preascertained
we can have preascertained
you can have preascertained
they can have preascertained	I can have been preascertaining
you can have been preascertaining
he can have been preascertaining
we can have been preascertaining
you can have been preascertaining
they can have been preascertaining	

Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I cannot preascertain
you cannot preascertain
he cannot preascertain
we cannot preascertain
you cannot preascertain
they cannot preascertain 	I cannot be preascertaining
you cannot be preascertaining
he cannot be preascertaining
we cannot be preascertaining
you cannot be preascertaining
they cannot be preascertaining	I cannot have preascertained
you cannot have preascertained
he cannot have preascertained
we cannot have preascertained
you cannot have preascertained
they cannot have preascertained	I cannot have been preascertaining
you cannot have been preascertaining
he cannot have been preascertaining
we cannot have been preascertaining
you cannot have been preascertaining
they cannot have been preascertaining	

Forma interrogativa 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
can I preascertain?
can you preascertain?
can he preascertain?
can we preascertain?
can you preascertain?
can they preascertain? 	can I be preascertaining?
can you be preascertaining?
can he be preascertaining?
can we be preascertaining?
can you be preascertaining?
can they be preascertaining? 	can I have preascertained?
can you have preascertained?
can he have preascertained?
can we have preascertained?
can you have preascertained?
can they have preascertained? 	can I have been preascertaining?
can you have been preascertaining?
can he have been preascertaining?
can we have been preascertaining?
can you have been preascertaining?
can they have been preascertaining? 	

Forma interro-Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
can I not preascertain?
can you not preascertain?
can he not preascertain?
can we not preascertain?
can you not preascertain?
can they not preascertain? 	can I not be preascertaining?
can you not be preascertaining?
can he not be preascertaining?
can we not be preascertaining?
can you not be preascertaining?
can they not be preascertaining? 	can I not have preascertained?
can you not have preascertained?
can he not have preascertained?
can we not have preascertained?
can you not have preascertained?
can they not have preascertained? 	can I not have been preascertaining?
can you not have been preascertaining?
can he not have been preascertaining?
can we not have been preascertaining?
can you not have been preascertaining?
can they not have been preascertaining?