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