I could title you could title he could title we could title you could title they could title
V-ing form
I could be titling you could be titling he could be titling we could be titling you could be titling they could be titling
Perfect
I could have titled you could have titled he could have titled we could have titled you could have titled they could have titled
V-ing perfect
I could have been titling you could have been titling he could have been titling we could have been titling you could have been titling they could have been titling
Negation
Simple form
I couldn't title you couldn't title he couldn't title we couldn't title you couldn't title they couldn't title
V-ing form
I couldn't be titling you couldn't be titling he couldn't be titling we couldn't be titling you couldn't be titling they couldn't be titling
Perfect
I couldn't have titled you couldn't have titled he couldn't have titled we couldn't have titled you couldn't have titled they couldn't have titled
V-ing perfect
I couldn't have been titling you couldn't have been titling he couldn't have been titling we couldn't have been titling you couldn't have been titling they couldn't have been titling
Interrogative form
Simple form
could I title? could you title? could he title? could we title? could you title? could they title?
V-ing form
could I be titling? could you be titling? could he be titling? could we be titling? could you be titling? could they be titling?
Perfect
could I have titled? could you have titled? could he have titled? could we have titled? could you have titled? could they have titled?
V-ing perfect
could I have been titling? could you have been titling? could he have been titling? could we have been titling? could you have been titling? could they have been titling?
Interro-negative form
Simple form
couldn't I title? couldn't you title? couldn't he title? couldn't we title? couldn't you title? couldn't they title?
V-ing form
couldn't I be titling? couldn't you be titling? couldn't he be titling? couldn't we be titling? couldn't you be titling? couldn't they be titling?
Perfect
couldn't I have titled? couldn't you have titled? couldn't he have titled? couldn't we have titled? couldn't you have titled? couldn't they have titled?
V-ing perfect
couldn't I have been titling? couldn't you have been titling? couldn't he have been titling? couldn't we have been titling? couldn't you have been titling? couldn't they have been titling?