can preexist
Regular verb: preexist - preexisted- preexisted

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I can preexist
you can preexist
he can preexist
we can preexist
you can preexist
they can preexist 	I can be preexisting
you can be preexisting
he can be preexisting
we can be preexisting
you can be preexisting
they can be preexisting	I can have preexisted
you can have preexisted
he can have preexisted
we can have preexisted
you can have preexisted
they can have preexisted	I can have been preexisting
you can have been preexisting
he can have been preexisting
we can have been preexisting
you can have been preexisting
they can have been preexisting	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I can't preexist
you can't preexist
he can't preexist
we can't preexist
you can't preexist
they can't preexist 	I can't be preexisting
you can't be preexisting
he can't be preexisting
we can't be preexisting
you can't be preexisting
they can't be preexisting	I can't have preexisted
you can't have preexisted
he can't have preexisted
we can't have preexisted
you can't have preexisted
they can't have preexisted	I can't have been preexisting
you can't have been preexisting
he can't have been preexisting
we can't have been preexisting
you can't have been preexisting
they can't have been preexisting	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
can I preexist?
can you preexist?
can he preexist?
can we preexist?
can you preexist?
can they preexist? 	can I be preexisting?
can you be preexisting?
can he be preexisting?
can we be preexisting?
can you be preexisting?
can they be preexisting? 	can I have preexisted?
can you have preexisted?
can he have preexisted?
can we have preexisted?
can you have preexisted?
can they have preexisted? 	can I have been preexisting?
can you have been preexisting?
can he have been preexisting?
can we have been preexisting?
can you have been preexisting?
can they have been preexisting? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
can't I preexist?
can't you preexist?
can't he preexist?
can't we preexist?
can't you preexist?
can't they preexist? 	can't I be preexisting?
can't you be preexisting?
can't he be preexisting?
can't we be preexisting?
can't you be preexisting?
can't they be preexisting? 	can't I have preexisted?
can't you have preexisted?
can't he have preexisted?
can't we have preexisted?
can't you have preexisted?
can't they have preexisted? 	can't I have been preexisting?
can't you have been preexisting?
can't he have been preexisting?
can't we have been preexisting?
can't you have been preexisting?
can't they have been preexisting?