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