English verb conjugation
COULD PUZZLE

Regular verb: puzzle - puzzled - puzzled

Affirmation

Simple form	V-ing form
I could puzzle you could puzzle he could puzzle we could puzzle you could puzzle they could puzzle	I could be puzzling you could be puzzling he could be puzzling we could be puzzling you could be puzzling they could be puzzling
Perfect	V-ing perfect
I could have puzzled you could have puzzled he could have puzzled we could have puzzled you could have puzzled they could have puzzled	I could have been puzzling you could have been puzzling he could have been puzzling we could have been puzzling you could have been puzzling they could have been puzzling

Negation

Simple form	V-ing form
I could not puzzle you could not puzzle he could not puzzle we could not puzzle you could not puzzle they could not puzzle	I could not be puzzling you could not be puzzling he could not be puzzling we could not be puzzling you could not be puzzling they could not be puzzling
Perfect	V-ing perfect
I could not have puzzled you could not have puzzled he could not have puzzled we could not have puzzled you could not have puzzled they could not have puzzled	I could not have been puzzling you could not have been puzzling he could not have been puzzling we could not have been puzzling you could not have been puzzling they could not have been puzzling

Interrogative form

Simple form	V-ing form
could I puzzle? could you puzzle? could he puzzle? could we puzzle? could you puzzle? could they puzzle?	could I be puzzling? could you be puzzling? could he be puzzling? could we be puzzling? could you be puzzling? could they be puzzling?
Perfect	V-ing perfect
could I have puzzled? could you have puzzled? could he have puzzled? could we have puzzled? could you have puzzled? could they have puzzled?	could I have been puzzling? could you have been puzzling? could he have been puzzling? could we have been puzzling? could you have been puzzling? could they have been puzzling?

Interro-negative form

Simple form	V-ing form
could I not puzzle? could you not puzzle? could he not puzzle? could we not puzzle? could you not puzzle? could they not puzzle?	could I not be puzzling? could you not be puzzling? could he not be puzzling? could we not be puzzling? could you not be puzzling? could they not be puzzling?
Perfect	V-ing perfect
could I not have puzzled? could you not have puzzled? could he not have puzzled? could we not have puzzled? could you not have puzzled? could they not have puzzled?	could I not have been puzzling? could you not have been puzzling? could he not have been puzzling? could we not have been puzzling? could you not have been puzzling? could they not have been puzzling?