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