English verb conjugation
COULD FOCUS

Regular verb: focus - focused - focused

Affirmation

Simple form	V-ing form
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
Perfect	V-ing perfect
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
I couldn't focus you couldn't focus he couldn't focus we couldn't focus you couldn't focus they couldn't focus	I couldn't be focusing you couldn't be focusing he couldn't be focusing we couldn't be focusing you couldn't be focusing they couldn't be focusing
Perfect	V-ing perfect
I couldn't have focused you couldn't have focused he couldn't have focused we couldn't have focused you couldn't have focused they couldn't have focused	I couldn't have been focusing you couldn't have been focusing he couldn't have been focusing we couldn't have been focusing you couldn't have been focusing they couldn't have been focusing

Interrogative form

Simple form	V-ing form
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?
Perfect	V-ing perfect
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
couldn't I focus? couldn't you focus? couldn't he focus? couldn't we focus? couldn't you focus? couldn't they focus?	couldn't I be focusing? couldn't you be focusing? couldn't he be focusing? couldn't we be focusing? couldn't you be focusing? couldn't they be focusing?
Perfect	V-ing perfect
couldn't I have focused? couldn't you have focused? couldn't he have focused? couldn't we have focused? couldn't you have focused? couldn't they have focused?	couldn't I have been focusing? couldn't you have been focusing? couldn't he have been focusing? couldn't we have been focusing? couldn't you have been focusing? couldn't they have been focusing?