English verb conjugation
CAN OPEN

Regular verb: open - opened - opened

Affirmation

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