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