could prestress
Regular verb: prestress - prestressed- prestressed

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could prestress
you could prestress
he could prestress
we could prestress
you could prestress
they could prestress 	I could be prestressing
you could be prestressing
he could be prestressing
we could be prestressing
you could be prestressing
they could be prestressing	I could have prestressed
you could have prestressed
he could have prestressed
we could have prestressed
you could have prestressed
they could have prestressed	I could have been prestressing
you could have been prestressing
he could have been prestressing
we could have been prestressing
you could have been prestressing
they could have been prestressing	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could not prestress
you could not prestress
he could not prestress
we could not prestress
you could not prestress
they could not prestress 	I could not be prestressing
you could not be prestressing
he could not be prestressing
we could not be prestressing
you could not be prestressing
they could not be prestressing	I could not have prestressed
you could not have prestressed
he could not have prestressed
we could not have prestressed
you could not have prestressed
they could not have prestressed	I could not have been prestressing
you could not have been prestressing
he could not have been prestressing
we could not have been prestressing
you could not have been prestressing
they could not have been prestressing	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I prestress?
could you prestress?
could he prestress?
could we prestress?
could you prestress?
could they prestress? 	could I be prestressing?
could you be prestressing?
could he be prestressing?
could we be prestressing?
could you be prestressing?
could they be prestressing? 	could I have prestressed?
could you have prestressed?
could he have prestressed?
could we have prestressed?
could you have prestressed?
could they have prestressed? 	could I have been prestressing?
could you have been prestressing?
could he have been prestressing?
could we have been prestressing?
could you have been prestressing?
could they have been prestressing? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I not prestress?
could you not prestress?
could he not prestress?
could we not prestress?
could you not prestress?
could they not prestress? 	could I not be prestressing?
could you not be prestressing?
could he not be prestressing?
could we not be prestressing?
could you not be prestressing?
could they not be prestressing? 	could I not have prestressed?
could you not have prestressed?
could he not have prestressed?
could we not have prestressed?
could you not have prestressed?
could they not have prestressed? 	could I not have been prestressing?
could you not have been prestressing?
could he not have been prestressing?
could we not have been prestressing?
could you not have been prestressing?
could they not have been prestressing?