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 must not castle you must not castle he must not castle we must not castle you must not castle they must not castle	I must not be castling you must not be castling he must not be castling we must not be castling you must not be castling they must not be castling
Perfect	V-ing perfect
I must not have castled you must not have castled he must not have castled we must not have castled you must not have castled they must not have castled	I must not have been castling you must not have been castling he must not have been castling we must not have been castling you must not have been castling they must not 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
must I not castle? must you not castle? must he not castle? must we not castle? must you not castle? must they not castle?	must I not be castling? must you not be castling? must he not be castling? must we not be castling? must you not be castling? must they not be castling?
Perfect	V-ing perfect
must I not have castled? must you not have castled? must he not have castled? must we not have castled? must you not have castled? must they not have castled?	must I not have been castling? must you not have been castling? must he not have been castling? must we not have been castling? must you not have been castling? must they not have been castling?