English verb conjugation
CAN OPEN

Regular verb: open - opened - opened

Affirmation

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