I can prowl you can prowl he can prowl we can prowl you can prowl they can prowl
V-ing form
I can be prowling you can be prowling he can be prowling we can be prowling you can be prowling they can be prowling
Perfect
I can have prowled you can have prowled he can have prowled we can have prowled you can have prowled they can have prowled
V-ing perfect
I can have been prowling you can have been prowling he can have been prowling we can have been prowling you can have been prowling they can have been prowling
Negation
Simple form
I cannot prowl you cannot prowl he cannot prowl we cannot prowl you cannot prowl they cannot prowl
V-ing form
I cannot be prowling you cannot be prowling he cannot be prowling we cannot be prowling you cannot be prowling they cannot be prowling
Perfect
I cannot have prowled you cannot have prowled he cannot have prowled we cannot have prowled you cannot have prowled they cannot have prowled
V-ing perfect
I cannot have been prowling you cannot have been prowling he cannot have been prowling we cannot have been prowling you cannot have been prowling they cannot have been prowling
Interrogative form
Simple form
can I prowl? can you prowl? can he prowl? can we prowl? can you prowl? can they prowl?
V-ing form
can I be prowling? can you be prowling? can he be prowling? can we be prowling? can you be prowling? can they be prowling?
Perfect
can I have prowled? can you have prowled? can he have prowled? can we have prowled? can you have prowled? can they have prowled?
V-ing perfect
can I have been prowling? can you have been prowling? can he have been prowling? can we have been prowling? can you have been prowling? can they have been prowling?
Interro-negative form
Simple form
can I not prowl? can you not prowl? can he not prowl? can we not prowl? can you not prowl? can they not prowl?
V-ing form
can I not be prowling? can you not be prowling? can he not be prowling? can we not be prowling? can you not be prowling? can they not be prowling?
Perfect
can I not have prowled? can you not have prowled? can he not have prowled? can we not have prowled? can you not have prowled? can they not have prowled?
V-ing perfect
can I not have been prowling? can you not have been prowling? can he not have been prowling? can we not have been prowling? can you not have been prowling? can they not have been prowling?