English verb conjugation
CAN FOCUS

Regular verb: focus - focused - focused

Affirmation

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

Negation

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

Interrogative form

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

Interro-negative form

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