I can ascend you can ascend he can ascend we can ascend you can ascend they can ascend
V-ing form
I can be ascending you can be ascending he can be ascending we can be ascending you can be ascending they can be ascending
Perfect
I can have ascended you can have ascended he can have ascended we can have ascended you can have ascended they can have ascended
V-ing perfect
I can have been ascending you can have been ascending he can have been ascending we can have been ascending you can have been ascending they can have been ascending
Negation
Simple form
I can't ascend you can't ascend he can't ascend we can't ascend you can't ascend they can't ascend
V-ing form
I can't be ascending you can't be ascending he can't be ascending we can't be ascending you can't be ascending they can't be ascending
Perfect
I can't have ascended you can't have ascended he can't have ascended we can't have ascended you can't have ascended they can't have ascended
V-ing perfect
I can't have been ascending you can't have been ascending he can't have been ascending we can't have been ascending you can't have been ascending they can't have been ascending
Interrogative form
Simple form
can I ascend? can you ascend? can he ascend? can we ascend? can you ascend? can they ascend?
V-ing form
can I be ascending? can you be ascending? can he be ascending? can we be ascending? can you be ascending? can they be ascending?
Perfect
can I have ascended? can you have ascended? can he have ascended? can we have ascended? can you have ascended? can they have ascended?
V-ing perfect
can I have been ascending? can you have been ascending? can he have been ascending? can we have been ascending? can you have been ascending? can they have been ascending?
Interro-negative form
Simple form
can't I ascend? can't you ascend? can't he ascend? can't we ascend? can't you ascend? can't they ascend?
V-ing form
can't I be ascending? can't you be ascending? can't he be ascending? can't we be ascending? can't you be ascending? can't they be ascending?
Perfect
can't I have ascended? can't you have ascended? can't he have ascended? can't we have ascended? can't you have ascended? can't they have ascended?
V-ing perfect
can't I have been ascending? can't you have been ascending? can't he have been ascending? can't we have been ascending? can't you have been ascending? can't they have been ascending?