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