may preascertain
Regular verb: preascertain - preascertained- preascertained

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

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mayn't preascertain
you mayn't preascertain
he mayn't preascertain
we mayn't preascertain
you mayn't preascertain
they mayn't preascertain 	I mayn't be preascertaining
you mayn't be preascertaining
he mayn't be preascertaining
we mayn't be preascertaining
you mayn't be preascertaining
they mayn't be preascertaining	I mayn't have preascertained
you mayn't have preascertained
he mayn't have preascertained
we mayn't have preascertained
you mayn't have preascertained
they mayn't have preascertained	I mayn't have been preascertaining
you mayn't have been preascertaining
he mayn't have been preascertaining
we mayn't have been preascertaining
you mayn't have been preascertaining
they mayn't have been preascertaining	

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

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