I could crunch you could crunch she could crunch we could crunch you could crunch they could crunch
V-ing form
I could be crunching you could be crunching she could be crunching we could be crunching you could be crunching they could be crunching
Perfect
I could have crunched you could have crunched she could have crunched we could have crunched you could have crunched they could have crunched
V-ing perfect
I could have been crunching you could have been crunching she could have been crunching we could have been crunching you could have been crunching they could have been crunching
Negation
Simple form
I couldn't crunch you couldn't crunch she couldn't crunch we couldn't crunch you couldn't crunch they couldn't crunch
V-ing form
I couldn't be crunching you couldn't be crunching she couldn't be crunching we couldn't be crunching you couldn't be crunching they couldn't be crunching
Perfect
I couldn't have crunched you couldn't have crunched she couldn't have crunched we couldn't have crunched you couldn't have crunched they couldn't have crunched
V-ing perfect
I couldn't have been crunching you couldn't have been crunching she couldn't have been crunching we couldn't have been crunching you couldn't have been crunching they couldn't have been crunching
Interrogative form
Simple form
could I crunch? could you crunch? could she crunch? could we crunch? could you crunch? could they crunch?
V-ing form
could I be crunching? could you be crunching? could she be crunching? could we be crunching? could you be crunching? could they be crunching?
Perfect
could I have crunched? could you have crunched? could she have crunched? could we have crunched? could you have crunched? could they have crunched?
V-ing perfect
could I have been crunching? could you have been crunching? could she have been crunching? could we have been crunching? could you have been crunching? could they have been crunching?
Interro-negative form
Simple form
couldn't I crunch? couldn't you crunch? couldn't she crunch? couldn't we crunch? couldn't you crunch? couldn't they crunch?
V-ing form
couldn't I be crunching? couldn't you be crunching? couldn't she be crunching? couldn't we be crunching? couldn't you be crunching? couldn't they be crunching?
Perfect
couldn't I have crunched? couldn't you have crunched? couldn't she have crunched? couldn't we have crunched? couldn't you have crunched? couldn't they have crunched?
V-ing perfect
couldn't I have been crunching? couldn't you have been crunching? couldn't she have been crunching? couldn't we have been crunching? couldn't you have been crunching? couldn't they have been crunching?