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