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 couldn't dial you couldn't dial he couldn't dial we couldn't dial you couldn't dial they couldn't dial
V-ing form
I couldn't be dialling you couldn't be dialling he couldn't be dialling we couldn't be dialling you couldn't be dialling they couldn't be dialling
Perfect
I couldn't have dialled you couldn't have dialled he couldn't have dialled we couldn't have dialled you couldn't have dialled they couldn't have dialled
V-ing perfect
I couldn't have been dialling you couldn't have been dialling he couldn't have been dialling we couldn't have been dialling you couldn't have been dialling they couldn't 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
couldn't I dial? couldn't you dial? couldn't he dial? couldn't we dial? couldn't you dial? couldn't they dial?
V-ing form
couldn't I be dialling? couldn't you be dialling? couldn't he be dialling? couldn't we be dialling? couldn't you be dialling? couldn't they be dialling?
Perfect
couldn't I have dialled? couldn't you have dialled? couldn't he have dialled? couldn't we have dialled? couldn't you have dialled? couldn't they have dialled?
V-ing perfect
couldn't I have been dialling? couldn't you have been dialling? couldn't he have been dialling? couldn't we have been dialling? couldn't you have been dialling? couldn't they have been dialling?