could focus
Regular verb: focus - focused- focused

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could focus
you could focus
he could focus
we could focus
you could focus
they could focus 	I could be focusing
you could be focusing
he could be focusing
we could be focusing
you could be focusing
they could be focusing	I could have focused
you could have focused
he could have focused
we could have focused
you could have focused
they could have focused	I could have been focusing
you could have been focusing
he could have been focusing
we could have been focusing
you could have been focusing
they could have been focusing	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could not focus
you could not focus
he could not focus
we could not focus
you could not focus
they could not focus 	I could not be focusing
you could not be focusing
he could not be focusing
we could not be focusing
you could not be focusing
they could not be focusing	I could not have focused
you could not have focused
he could not have focused
we could not have focused
you could not have focused
they could not have focused	I could not have been focusing
you could not have been focusing
he could not have been focusing
we could not have been focusing
you could not have been focusing
they could not have been focusing	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I focus?
could you focus?
could he focus?
could we focus?
could you focus?
could they focus? 	could I be focusing?
could you be focusing?
could he be focusing?
could we be focusing?
could you be focusing?
could they be focusing? 	could I have focused?
could you have focused?
could he have focused?
could we have focused?
could you have focused?
could they have focused? 	could I have been focusing?
could you have been focusing?
could he have been focusing?
could we have been focusing?
could you have been focusing?
could they have been focusing? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I not focus?
could you not focus?
could he not focus?
could we not focus?
could you not focus?
could they not focus? 	could I not be focusing?
could you not be focusing?
could he not be focusing?
could we not be focusing?
could you not be focusing?
could they not be focusing? 	could I not have focused?
could you not have focused?
could he not have focused?
could we not have focused?
could you not have focused?
could they not have focused? 	could I not have been focusing?
could you not have been focusing?
could he not have been focusing?
could we not have been focusing?
could you not have been focusing?
could they not have been focusing?