I could double-tongue you could double-tongue he 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 he 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 he 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 he 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 couldn't double-tongue you couldn't double-tongue he couldn't double-tongue we couldn't double-tongue you couldn't double-tongue they couldn't double-tongue
V-ing form
I couldn't be double-tonguing you couldn't be double-tonguing he couldn't be double-tonguing we couldn't be double-tonguing you couldn't be double-tonguing they couldn't be double-tonguing
Perfect
I couldn't have double-tongued you couldn't have double-tongued he couldn't have double-tongued we couldn't have double-tongued you couldn't have double-tongued they couldn't have double-tongued
V-ing perfect
I couldn't have been double-tonguing you couldn't have been double-tonguing he couldn't have been double-tonguing we couldn't have been double-tonguing you couldn't have been double-tonguing they couldn't have been double-tonguing
Interrogative form
Simple form
could I double-tongue? could you double-tongue? could he 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 he 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 he 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 he 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
couldn't I double-tongue? couldn't you double-tongue? couldn't he double-tongue? couldn't we double-tongue? couldn't you double-tongue? couldn't they double-tongue?
V-ing form
couldn't I be double-tonguing? couldn't you be double-tonguing? couldn't he be double-tonguing? couldn't we be double-tonguing? couldn't you be double-tonguing? couldn't they be double-tonguing?
Perfect
couldn't I have double-tongued? couldn't you have double-tongued? couldn't he have double-tongued? couldn't we have double-tongued? couldn't you have double-tongued? couldn't they have double-tongued?
V-ing perfect
couldn't I have been double-tonguing? couldn't you have been double-tonguing? couldn't he have been double-tonguing? couldn't we have been double-tonguing? couldn't you have been double-tonguing? couldn't they have been double-tonguing?