can attach
Regular verb: attach - attached- attached

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
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	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 	Perfect 	V-ing perfect 	
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	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 	Perfect 	V-ing perfect 	
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? 	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 	Perfect 	V-ing perfect 	
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? 	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?