can castle
Regular verb: castle - castled- castled

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
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	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 	Perfect 	V-ing perfect 	
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	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 	Perfect 	V-ing perfect 	
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? 	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 	Perfect 	V-ing perfect 	
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? 	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?