I can categorise you can categorise he can categorise we can categorise you can categorise they can categorise
V-ing form
I can be categorising you can be categorising he can be categorising we can be categorising you can be categorising they can be categorising
Perfect
I can have categorised you can have categorised he 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 he can have been categorising we can have been categorising you can have been categorising they can have been categorising
Negation
Simple form
I can't categorise you can't categorise he can't categorise we can't categorise you can't categorise they can't categorise
V-ing form
I can't be categorising you can't be categorising he can't be categorising we can't be categorising you can't be categorising they can't be categorising
Perfect
I can't have categorised you can't have categorised he can't have categorised we can't have categorised you can't have categorised they can't have categorised
V-ing perfect
I can't have been categorising you can't have been categorising he can't have been categorising we can't have been categorising you can't have been categorising they can't have been categorising
Interrogative form
Simple form
can I categorise? can you categorise? can he categorise? can we categorise? can you categorise? can they categorise?
V-ing form
can I be categorising? can you be categorising? can he be categorising? can we be categorising? can you be categorising? can they be categorising?
Perfect
can I have categorised? can you have categorised? can he 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 he have been categorising? can we have been categorising? can you have been categorising? can they have been categorising?
Interro-negative form
Simple form
can't I categorise? can't you categorise? can't he categorise? can't we categorise? can't you categorise? can't they categorise?
V-ing form
can't I be categorising? can't you be categorising? can't he be categorising? can't we be categorising? can't you be categorising? can't they be categorising?
Perfect
can't I have categorised? can't you have categorised? can't he have categorised? can't we have categorised? can't you have categorised? can't they have categorised?
V-ing perfect
can't I have been categorising? can't you have been categorising? can't he have been categorising? can't we have been categorising? can't you have been categorising? can't they have been categorising?