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