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