I could boot you could boot he could boot we could boot you could boot they could boot
V-ing form
I could be booting you could be booting he could be booting we could be booting you could be booting they could be booting
Perfect
I could have booted you could have booted he could have booted we could have booted you could have booted they could have booted
V-ing perfect
I could have been booting you could have been booting he could have been booting we could have been booting you could have been booting they could have been booting
Negation
Simple form
I could not boot you could not boot he could not boot we could not boot you could not boot they could not boot
V-ing form
I could not be booting you could not be booting he could not be booting we could not be booting you could not be booting they could not be booting
Perfect
I could not have booted you could not have booted he could not have booted we could not have booted you could not have booted they could not have booted
V-ing perfect
I could not have been booting you could not have been booting he could not have been booting we could not have been booting you could not have been booting they could not have been booting
Interrogative form
Simple form
could I boot? could you boot? could he boot? could we boot? could you boot? could they boot?
V-ing form
could I be booting? could you be booting? could he be booting? could we be booting? could you be booting? could they be booting?
Perfect
could I have booted? could you have booted? could he have booted? could we have booted? could you have booted? could they have booted?
V-ing perfect
could I have been booting? could you have been booting? could he have been booting? could we have been booting? could you have been booting? could they have been booting?
Interro-negative form
Simple form
could I not boot? could you not boot? could he not boot? could we not boot? could you not boot? could they not boot?
V-ing form
could I not be booting? could you not be booting? could he not be booting? could we not be booting? could you not be booting? could they not be booting?
Perfect
could I not have booted? could you not have booted? could he not have booted? could we not have booted? could you not have booted? could they not have booted?
V-ing perfect
could I not have been booting? could you not have been booting? could he not have been booting? could we not have been booting? could you not have been booting? could they not have been booting?