I must double-tongue you must double-tongue he must double-tongue we must double-tongue you must double-tongue they must double-tongue
V-ing form
I must be double-tonguing you must be double-tonguing he must be double-tonguing we must be double-tonguing you must be double-tonguing they must be double-tonguing
Perfect
I must have double-tongued you must have double-tongued he must have double-tongued we must have double-tongued you must have double-tongued they must have double-tongued
V-ing perfect
I must have been double-tonguing you must have been double-tonguing he must have been double-tonguing we must have been double-tonguing you must have been double-tonguing they must have been double-tonguing
Negation
Simple form
I must not double-tongue you must not double-tongue he must not double-tongue we must not double-tongue you must not double-tongue they must not double-tongue
V-ing form
I must not be double-tonguing you must not be double-tonguing he must not be double-tonguing we must not be double-tonguing you must not be double-tonguing they must not be double-tonguing
Perfect
I must not have double-tongued you must not have double-tongued he must not have double-tongued we must not have double-tongued you must not have double-tongued they must not have double-tongued
V-ing perfect
I must not have been double-tonguing you must not have been double-tonguing he must not have been double-tonguing we must not have been double-tonguing you must not have been double-tonguing they must not have been double-tonguing
Interrogative form
Simple form
must I double-tongue? must you double-tongue? must he double-tongue? must we double-tongue? must you double-tongue? must they double-tongue?
V-ing form
must I be double-tonguing? must you be double-tonguing? must he be double-tonguing? must we be double-tonguing? must you be double-tonguing? must they be double-tonguing?
Perfect
must I have double-tongued? must you have double-tongued? must he have double-tongued? must we have double-tongued? must you have double-tongued? must they have double-tongued?
V-ing perfect
must I have been double-tonguing? must you have been double-tonguing? must he have been double-tonguing? must we have been double-tonguing? must you have been double-tonguing? must they have been double-tonguing?
Interro-negative form
Simple form
must I not double-tongue? must you not double-tongue? must he not double-tongue? must we not double-tongue? must you not double-tongue? must they not double-tongue?
V-ing form
must I not be double-tonguing? must you not be double-tonguing? must he not be double-tonguing? must we not be double-tonguing? must you not be double-tonguing? must they not be double-tonguing?
Perfect
must I not have double-tongued? must you not have double-tongued? must he not have double-tongued? must we not have double-tongued? must you not have double-tongued? must they not have double-tongued?
V-ing perfect
must I not have been double-tonguing? must you not have been double-tonguing? must he not have been double-tonguing? must we not have been double-tonguing? must you not have been double-tonguing? must they not have been double-tonguing?