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