Regular verb: open open - open opened - open opened
Warning, this verb may not exist. Conjugation is given as example.
Affirmation
Simple form
I could open open you could open open she could open open we could open open you could open open they could open open
V-ing form
I could be open opening you could be open opening she could be open opening we could be open opening you could be open opening they could be open opening
Perfect
I could have open opened you could have open opened she could have open opened we could have open opened you could have open opened they could have open opened
V-ing perfect
I could have been open opening you could have been open opening she could have been open opening we could have been open opening you could have been open opening they could have been open opening
Negation
Simple form
I could not open open you could not open open she could not open open we could not open open you could not open open they could not open open
V-ing form
I could not be open opening you could not be open opening she could not be open opening we could not be open opening you could not be open opening they could not be open opening
Perfect
I could not have open opened you could not have open opened she could not have open opened we could not have open opened you could not have open opened they could not have open opened
V-ing perfect
I could not have been open opening you could not have been open opening she could not have been open opening we could not have been open opening you could not have been open opening they could not have been open opening
Interrogative form
Simple form
could I open open? could you open open? could she open open? could we open open? could you open open? could they open open?
V-ing form
could I be open opening? could you be open opening? could she be open opening? could we be open opening? could you be open opening? could they be open opening?
Perfect
could I have open opened? could you have open opened? could she have open opened? could we have open opened? could you have open opened? could they have open opened?
V-ing perfect
could I have been open opening? could you have been open opening? could she have been open opening? could we have been open opening? could you have been open opening? could they have been open opening?
Interro-negative form
Simple form
could I not open open? could you not open open? could she not open open? could we not open open? could you not open open? could they not open open?
V-ing form
could I not be open opening? could you not be open opening? could she not be open opening? could we not be open opening? could you not be open opening? could they not be open opening?
Perfect
could I not have open opened? could you not have open opened? could she not have open opened? could we not have open opened? could you not have open opened? could they not have open opened?
V-ing perfect
could I not have been open opening? could you not have been open opening? could she not have been open opening? could we not have been open opening? could you not have been open opening? could they not have been open opening?