could preexist
Regular verb: preexist - preexisted- preexisted

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

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

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

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