English verb conjugation
COULD CLUE

Regular verb: clue - clued - clued

Affirmation

Simple form	V-ing form
I could clue you could clue he could clue we could clue you could clue they could clue	I could be cluing you could be cluing he could be cluing we could be cluing you could be cluing they could be cluing
Perfect	V-ing perfect
I could have clued you could have clued he could have clued we could have clued you could have clued they could have clued	I could have been cluing you could have been cluing he could have been cluing we could have been cluing you could have been cluing they could have been cluing

Negation

Simple form	V-ing form
I couldn't clue you couldn't clue he couldn't clue we couldn't clue you couldn't clue they couldn't clue	I couldn't be cluing you couldn't be cluing he couldn't be cluing we couldn't be cluing you couldn't be cluing they couldn't be cluing
Perfect	V-ing perfect
I couldn't have clued you couldn't have clued he couldn't have clued we couldn't have clued you couldn't have clued they couldn't have clued	I couldn't have been cluing you couldn't have been cluing he couldn't have been cluing we couldn't have been cluing you couldn't have been cluing they couldn't have been cluing

Interrogative form

Simple form	V-ing form
could I clue? could you clue? could he clue? could we clue? could you clue? could they clue?	could I be cluing? could you be cluing? could he be cluing? could we be cluing? could you be cluing? could they be cluing?
Perfect	V-ing perfect
could I have clued? could you have clued? could he have clued? could we have clued? could you have clued? could they have clued?	could I have been cluing? could you have been cluing? could he have been cluing? could we have been cluing? could you have been cluing? could they have been cluing?

Interro-negative form

Simple form	V-ing form
couldn't I clue? couldn't you clue? couldn't he clue? couldn't we clue? couldn't you clue? couldn't they clue?	couldn't I be cluing? couldn't you be cluing? couldn't he be cluing? couldn't we be cluing? couldn't you be cluing? couldn't they be cluing?
Perfect	V-ing perfect
couldn't I have clued? couldn't you have clued? couldn't he have clued? couldn't we have clued? couldn't you have clued? couldn't they have clued?	couldn't I have been cluing? couldn't you have been cluing? couldn't he have been cluing? couldn't we have been cluing? couldn't you have been cluing? couldn't they have been cluing?