shall preascertain
Regular verb: preascertain - preascertained- preascertained

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I shall preascertain
you shall preascertain
he shall preascertain
we shall preascertain
you shall preascertain
they shall preascertain 	I shall be preascertaining
you shall be preascertaining
he shall be preascertaining
we shall be preascertaining
you shall be preascertaining
they shall be preascertaining	I shall have preascertained
you shall have preascertained
he shall have preascertained
we shall have preascertained
you shall have preascertained
they shall have preascertained	I shall have been preascertaining
you shall have been preascertaining
he shall have been preascertaining
we shall have been preascertaining
you shall have been preascertaining
they shall have been preascertaining	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I shall not preascertain
you shall not preascertain
he shall not preascertain
we shall not preascertain
you shall not preascertain
they shall not preascertain 	I shall not be preascertaining
you shall not be preascertaining
he shall not be preascertaining
we shall not be preascertaining
you shall not be preascertaining
they shall not be preascertaining	I shall not have preascertained
you shall not have preascertained
he shall not have preascertained
we shall not have preascertained
you shall not have preascertained
they shall not have preascertained	I shall not have been preascertaining
you shall not have been preascertaining
he shall not have been preascertaining
we shall not have been preascertaining
you shall not have been preascertaining
they shall not have been preascertaining	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
shall I preascertain?
shall you preascertain?
shall he preascertain?
shall we preascertain?
shall you preascertain?
shall they preascertain? 	shall I be preascertaining?
shall you be preascertaining?
shall he be preascertaining?
shall we be preascertaining?
shall you be preascertaining?
shall they be preascertaining? 	shall I have preascertained?
shall you have preascertained?
shall he have preascertained?
shall we have preascertained?
shall you have preascertained?
shall they have preascertained? 	shall I have been preascertaining?
shall you have been preascertaining?
shall he have been preascertaining?
shall we have been preascertaining?
shall you have been preascertaining?
shall they have been preascertaining? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
shall I not preascertain?
shall you not preascertain?
shall he not preascertain?
shall we not preascertain?
shall you not preascertain?
shall they not preascertain? 	shall I not be preascertaining?
shall you not be preascertaining?
shall he not be preascertaining?
shall we not be preascertaining?
shall you not be preascertaining?
shall they not be preascertaining? 	shall I not have preascertained?
shall you not have preascertained?
shall he not have preascertained?
shall we not have preascertained?
shall you not have preascertained?
shall they not have preascertained? 	shall I not have been preascertaining?
shall you not have been preascertaining?
shall he not have been preascertaining?
shall we not have been preascertaining?
shall you not have been preascertaining?
shall they not have been preascertaining?