I can categorise you can categorise she can categorise we can categorise you can categorise they can categorise
V-ing form
I can be categorising you can be categorising she can be categorising we can be categorising you can be categorising they can be categorising
Perfect
I can have categorised you can have categorised she can have categorised we can have categorised you can have categorised they can have categorised
V-ing perfect
I can have been categorising you can have been categorising she can have been categorising we can have been categorising you can have been categorising they can have been categorising
Negation
Simple form
I cannot categorise you cannot categorise she cannot categorise we cannot categorise you cannot categorise they cannot categorise
V-ing form
I cannot be categorising you cannot be categorising she cannot be categorising we cannot be categorising you cannot be categorising they cannot be categorising
Perfect
I cannot have categorised you cannot have categorised she cannot have categorised we cannot have categorised you cannot have categorised they cannot have categorised
V-ing perfect
I cannot have been categorising you cannot have been categorising she cannot have been categorising we cannot have been categorising you cannot have been categorising they cannot have been categorising
Interrogative form
Simple form
can I categorise? can you categorise? can she categorise? can we categorise? can you categorise? can they categorise?
V-ing form
can I be categorising? can you be categorising? can she be categorising? can we be categorising? can you be categorising? can they be categorising?
Perfect
can I have categorised? can you have categorised? can she have categorised? can we have categorised? can you have categorised? can they have categorised?
V-ing perfect
can I have been categorising? can you have been categorising? can she have been categorising? can we have been categorising? can you have been categorising? can they have been categorising?
Interro-negative form
Simple form
can I not categorise? can you not categorise? can she not categorise? can we not categorise? can you not categorise? can they not categorise?
V-ing form
can I not be categorising? can you not be categorising? can she not be categorising? can we not be categorising? can you not be categorising? can they not be categorising?
Perfect
can I not have categorised? can you not have categorised? can she not have categorised? can we not have categorised? can you not have categorised? can they not have categorised?
V-ing perfect
can I not have been categorising? can you not have been categorising? can she not have been categorising? can we not have been categorising? can you not have been categorising? can they not have been categorising?