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