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