English verb conjugation
MUST CASTLE

Regular verb: castle - castled - castled

Affirmation

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