I could abseil you could abseil she could abseil we could abseil you could abseil they could abseil
V-ing form
I could be abseiling you could be abseiling she could be abseiling we could be abseiling you could be abseiling they could be abseiling
Perfect
I could have abseiled you could have abseiled she could have abseiled we could have abseiled you could have abseiled they could have abseiled
V-ing perfect
I could have been abseiling you could have been abseiling she could have been abseiling we could have been abseiling you could have been abseiling they could have been abseiling
Negation
Simple form
I couldn't abseil you couldn't abseil she couldn't abseil we couldn't abseil you couldn't abseil they couldn't abseil
V-ing form
I couldn't be abseiling you couldn't be abseiling she couldn't be abseiling we couldn't be abseiling you couldn't be abseiling they couldn't be abseiling
Perfect
I couldn't have abseiled you couldn't have abseiled she couldn't have abseiled we couldn't have abseiled you couldn't have abseiled they couldn't have abseiled
V-ing perfect
I couldn't have been abseiling you couldn't have been abseiling she couldn't have been abseiling we couldn't have been abseiling you couldn't have been abseiling they couldn't have been abseiling
Interrogative form
Simple form
could I abseil? could you abseil? could she abseil? could we abseil? could you abseil? could they abseil?
V-ing form
could I be abseiling? could you be abseiling? could she be abseiling? could we be abseiling? could you be abseiling? could they be abseiling?
Perfect
could I have abseiled? could you have abseiled? could she have abseiled? could we have abseiled? could you have abseiled? could they have abseiled?
V-ing perfect
could I have been abseiling? could you have been abseiling? could she have been abseiling? could we have been abseiling? could you have been abseiling? could they have been abseiling?
Interro-negative form
Simple form
couldn't I abseil? couldn't you abseil? couldn't she abseil? couldn't we abseil? couldn't you abseil? couldn't they abseil?
V-ing form
couldn't I be abseiling? couldn't you be abseiling? couldn't she be abseiling? couldn't we be abseiling? couldn't you be abseiling? couldn't they be abseiling?
Perfect
couldn't I have abseiled? couldn't you have abseiled? couldn't she have abseiled? couldn't we have abseiled? couldn't you have abseiled? couldn't they have abseiled?
V-ing perfect
couldn't I have been abseiling? couldn't you have been abseiling? couldn't she have been abseiling? couldn't we have been abseiling? couldn't you have been abseiling? couldn't they have been abseiling?