can open
Regular verb: open - opened- opened

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I can open
you can open
she can open
we can open
you can open
they can open 	I can be opening
you can be opening
she can be opening
we can be opening
you can be opening
they can be opening	I can have opened
you can have opened
she 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
she 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 cannot open
you cannot open
she cannot open
we cannot open
you cannot open
they cannot open 	I cannot be opening
you cannot be opening
she cannot be opening
we cannot be opening
you cannot be opening
they cannot be opening	I cannot have opened
you cannot have opened
she cannot have opened
we cannot have opened
you cannot have opened
they cannot have opened	I cannot have been opening
you cannot have been opening
she cannot have been opening
we cannot have been opening
you cannot have been opening
they cannot have been opening	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
can I open?
can you open?
can she open?
can we open?
can you open?
can they open? 	can I be opening?
can you be opening?
can she be opening?
can we be opening?
can you be opening?
can they be opening? 	can I have opened?
can you have opened?
can she 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 she 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 I not open?
can you not open?
can she not open?
can we not open?
can you not open?
can they not open? 	can I not be opening?
can you not be opening?
can she not be opening?
can we not be opening?
can you not be opening?
can they not be opening? 	can I not have opened?
can you not have opened?
can she not have opened?
can we not have opened?
can you not have opened?
can they not have opened? 	can I not have been opening?
can you not have been opening?
can she not have been opening?
can we not have been opening?
can you not have been opening?
can they not have been opening?