can open
Regular verb: open - opened- opened

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I can open
you can open
he can open
we can open
you can open
they can open 	I can be opening
you can be opening
he can be opening
we can be opening
you can be opening
they can be opening	I can have opened
you can have opened
he can have opened
we can have opened
you can have opened
they can have opened	I can have been opening
you can have been opening
he can have been opening
we can have been opening
you can have been opening
they can have been opening	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I can't open
you can't open
he can't open
we can't open
you can't open
they can't open 	I can't be opening
you can't be opening
he can't be opening
we can't be opening
you can't be opening
they can't be opening	I can't have opened
you can't have opened
he can't have opened
we can't have opened
you can't have opened
they can't have opened	I can't have been opening
you can't have been opening
he can't have been opening
we can't have been opening
you can't have been opening
they can't have been opening	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
can I open?
can you open?
can he open?
can we open?
can you open?
can they open? 	can I be opening?
can you be opening?
can he be opening?
can we be opening?
can you be opening?
can they be opening? 	can I have opened?
can you have opened?
can he have opened?
can we have opened?
can you have opened?
can they have opened? 	can I have been opening?
can you have been opening?
can he have been opening?
can we have been opening?
can you have been opening?
can they have been opening? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
can't I open?
can't you open?
can't he open?
can't we open?
can't you open?
can't they open? 	can't I be opening?
can't you be opening?
can't he be opening?
can't we be opening?
can't you be opening?
can't they be opening? 	can't I have opened?
can't you have opened?
can't he have opened?
can't we have opened?
can't you have opened?
can't they have opened? 	can't I have been opening?
can't you have been opening?
can't he have been opening?
can't we have been opening?
can't you have been opening?
can't they have been opening?