English verb conjugation
CAN CASTLE

Regular verb: castle - castled - castled

Affirmation

Simple form	V-ing form
I can castle you can castle he can castle we can castle you can castle they can castle	I can be castling you can be castling he can be castling we can be castling you can be castling they can be castling
Perfect	V-ing perfect
I can have castled you can have castled he can have castled we can have castled you can have castled they can have castled	I can have been castling you can have been castling he can have been castling we can have been castling you can have been castling they can have been castling

Negation

Simple form	V-ing form
I can't castle you can't castle he can't castle we can't castle you can't castle they can't castle	I can't be castling you can't be castling he can't be castling we can't be castling you can't be castling they can't be castling
Perfect	V-ing perfect
I can't have castled you can't have castled he can't have castled we can't have castled you can't have castled they can't have castled	I can't have been castling you can't have been castling he can't have been castling we can't have been castling you can't have been castling they can't have been castling

Interrogative form

Simple form	V-ing form
can I castle? can you castle? can he castle? can we castle? can you castle? can they castle?	can I be castling? can you be castling? can he be castling? can we be castling? can you be castling? can they be castling?
Perfect	V-ing perfect
can I have castled? can you have castled? can he have castled? can we have castled? can you have castled? can they have castled?	can I have been castling? can you have been castling? can he have been castling? can we have been castling? can you have been castling? can they have been castling?

Interro-negative form

Simple form	V-ing form
can't I castle? can't you castle? can't he castle? can't we castle? can't you castle? can't they castle?	can't I be castling? can't you be castling? can't he be castling? can't we be castling? can't you be castling? can't they be castling?
Perfect	V-ing perfect
can't I have castled? can't you have castled? can't he have castled? can't we have castled? can't you have castled? can't they have castled?	can't I have been castling? can't you have been castling? can't he have been castling? can't we have been castling? can't you have been castling? can't they have been castling?