I could dial you could dial he could dial we could dial you could dial they could dial
V-ing form
I could be dialling you could be dialling he could be dialling we could be dialling you could be dialling they could be dialling
Perfect
I could have dialled you could have dialled he could have dialled we could have dialled you could have dialled they could have dialled
V-ing perfect
I could have been dialling you could have been dialling he could have been dialling we could have been dialling you could have been dialling they could have been dialling
Negation
Simple form
I could not dial you could not dial he could not dial we could not dial you could not dial they could not dial
V-ing form
I could not be dialling you could not be dialling he could not be dialling we could not be dialling you could not be dialling they could not be dialling
Perfect
I could not have dialled you could not have dialled he could not have dialled we could not have dialled you could not have dialled they could not have dialled
V-ing perfect
I could not have been dialling you could not have been dialling he could not have been dialling we could not have been dialling you could not have been dialling they could not have been dialling
Interrogative form
Simple form
could I dial? could you dial? could he dial? could we dial? could you dial? could they dial?
V-ing form
could I be dialling? could you be dialling? could he be dialling? could we be dialling? could you be dialling? could they be dialling?
Perfect
could I have dialled? could you have dialled? could he have dialled? could we have dialled? could you have dialled? could they have dialled?
V-ing perfect
could I have been dialling? could you have been dialling? could he have been dialling? could we have been dialling? could you have been dialling? could they have been dialling?
Interro-negative form
Simple form
could I not dial? could you not dial? could he not dial? could we not dial? could you not dial? could they not dial?
V-ing form
could I not be dialling? could you not be dialling? could he not be dialling? could we not be dialling? could you not be dialling? could they not be dialling?
Perfect
could I not have dialled? could you not have dialled? could he not have dialled? could we not have dialled? could you not have dialled? could they not have dialled?
V-ing perfect
could I not have been dialling? could you not have been dialling? could he not have been dialling? could we not have been dialling? could you not have been dialling? could they not have been dialling?