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 couldn't puzzle you couldn't puzzle he couldn't puzzle we couldn't puzzle you couldn't puzzle they couldn't puzzle	I couldn't be puzzling you couldn't be puzzling he couldn't be puzzling we couldn't be puzzling you couldn't be puzzling they couldn't be puzzling
Perfect	V-ing perfect
I couldn't have puzzled you couldn't have puzzled he couldn't have puzzled we couldn't have puzzled you couldn't have puzzled they couldn't have puzzled	I couldn't have been puzzling you couldn't have been puzzling he couldn't have been puzzling we couldn't have been puzzling you couldn't have been puzzling they couldn't 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
couldn't I puzzle? couldn't you puzzle? couldn't he puzzle? couldn't we puzzle? couldn't you puzzle? couldn't they puzzle?	couldn't I be puzzling? couldn't you be puzzling? couldn't he be puzzling? couldn't we be puzzling? couldn't you be puzzling? couldn't they be puzzling?
Perfect	V-ing perfect
couldn't I have puzzled? couldn't you have puzzled? couldn't he have puzzled? couldn't we have puzzled? couldn't you have puzzled? couldn't they have puzzled?	couldn't I have been puzzling? couldn't you have been puzzling? couldn't he have been puzzling? couldn't we have been puzzling? couldn't you have been puzzling? couldn't they have been puzzling?