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 could not title you could not title he could not title we could not title you could not title they could not title
V-ing form
I could not be titling you could not be titling he could not be titling we could not be titling you could not be titling they could not be titling
Perfect
I could not have titled you could not have titled he could not have titled we could not have titled you could not have titled they could not have titled
V-ing perfect
I could not have been titling you could not have been titling he could not have been titling we could not have been titling you could not have been titling they could not 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
could I not title? could you not title? could he not title? could we not title? could you not title? could they not title?
V-ing form
could I not be titling? could you not be titling? could he not be titling? could we not be titling? could you not be titling? could they not be titling?
Perfect
could I not have titled? could you not have titled? could he not have titled? could we not have titled? could you not have titled? could they not have titled?
V-ing perfect
could I not have been titling? could you not have been titling? could he not have been titling? could we not have been titling? could you not have been titling? could they not have been titling?