English verb conjugation
COULD CASTLE

Regular verb: castle - castled - castled

Affirmation

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

Negation

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

Interrogative form

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

Interro-negative form

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