must castle
Regular verb: castle - castled- castled

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

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

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

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