English verb conjugation
CAN ATTACH

Regular verb: attach - attached - attached

Affirmation

Simple form	V-ing form
I can attach you can attach he can attach we can attach you can attach they can attach	I can be attaching you can be attaching he can be attaching we can be attaching you can be attaching they can be attaching
Perfect	V-ing perfect
I can have attached you can have attached he can have attached we can have attached you can have attached they can have attached	I can have been attaching you can have been attaching he can have been attaching we can have been attaching you can have been attaching they can have been attaching

Negation

Simple form	V-ing form
I can't attach you can't attach he can't attach we can't attach you can't attach they can't attach	I can't be attaching you can't be attaching he can't be attaching we can't be attaching you can't be attaching they can't be attaching
Perfect	V-ing perfect
I can't have attached you can't have attached he can't have attached we can't have attached you can't have attached they can't have attached	I can't have been attaching you can't have been attaching he can't have been attaching we can't have been attaching you can't have been attaching they can't have been attaching

Interrogative form

Simple form	V-ing form
can I attach? can you attach? can he attach? can we attach? can you attach? can they attach?	can I be attaching? can you be attaching? can he be attaching? can we be attaching? can you be attaching? can they be attaching?
Perfect	V-ing perfect
can I have attached? can you have attached? can he have attached? can we have attached? can you have attached? can they have attached?	can I have been attaching? can you have been attaching? can he have been attaching? can we have been attaching? can you have been attaching? can they have been attaching?

Interro-negative form

Simple form	V-ing form
can't I attach? can't you attach? can't he attach? can't we attach? can't you attach? can't they attach?	can't I be attaching? can't you be attaching? can't he be attaching? can't we be attaching? can't you be attaching? can't they be attaching?
Perfect	V-ing perfect
can't I have attached? can't you have attached? can't he have attached? can't we have attached? can't you have attached? can't they have attached?	can't I have been attaching? can't you have been attaching? can't he have been attaching? can't we have been attaching? can't you have been attaching? can't they have been attaching?