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