I can ascend you can ascend she can ascend we can ascend you can ascend they can ascend
V-ing form
I can be ascending you can be ascending she can be ascending we can be ascending you can be ascending they can be ascending
Perfect
I can have ascended you can have ascended she 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 she can have been ascending we can have been ascending you can have been ascending they can have been ascending
Negation
Simple form
I cannot ascend you cannot ascend she cannot ascend we cannot ascend you cannot ascend they cannot ascend
V-ing form
I cannot be ascending you cannot be ascending she cannot be ascending we cannot be ascending you cannot be ascending they cannot be ascending
Perfect
I cannot have ascended you cannot have ascended she cannot have ascended we cannot have ascended you cannot have ascended they cannot have ascended
V-ing perfect
I cannot have been ascending you cannot have been ascending she cannot have been ascending we cannot have been ascending you cannot have been ascending they cannot have been ascending
Interrogative form
Simple form
can I ascend? can you ascend? can she ascend? can we ascend? can you ascend? can they ascend?
V-ing form
can I be ascending? can you be ascending? can she be ascending? can we be ascending? can you be ascending? can they be ascending?
Perfect
can I have ascended? can you have ascended? can she 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 she have been ascending? can we have been ascending? can you have been ascending? can they have been ascending?
Interro-negative form
Simple form
can I not ascend? can you not ascend? can she not ascend? can we not ascend? can you not ascend? can they not ascend?
V-ing form
can I not be ascending? can you not be ascending? can she not be ascending? can we not be ascending? can you not be ascending? can they not be ascending?
Perfect
can I not have ascended? can you not have ascended? can she not have ascended? can we not have ascended? can you not have ascended? can they not have ascended?
V-ing perfect
can I not have been ascending? can you not have been ascending? can she not have been ascending? can we not have been ascending? can you not have been ascending? can they not have been ascending?