English verb conjugation
COULD CHAIN-SMOKE

Regular verb: chain-smoke - chain-smoked - chain-smoked

Affirmation

Simple form	V-ing form
I could chain-smoke you could chain-smoke he could chain-smoke we could chain-smoke you could chain-smoke they could chain-smoke	I could be chain-smoking you could be chain-smoking he could be chain-smoking we could be chain-smoking you could be chain-smoking they could be chain-smoking
Perfect	V-ing perfect
I could have chain-smoked you could have chain-smoked he could have chain-smoked we could have chain-smoked you could have chain-smoked they could have chain-smoked	I could have been chain-smoking you could have been chain-smoking he could have been chain-smoking we could have been chain-smoking you could have been chain-smoking they could have been chain-smoking

Negation

Simple form	V-ing form
I could not chain-smoke you could not chain-smoke he could not chain-smoke we could not chain-smoke you could not chain-smoke they could not chain-smoke	I could not be chain-smoking you could not be chain-smoking he could not be chain-smoking we could not be chain-smoking you could not be chain-smoking they could not be chain-smoking
Perfect	V-ing perfect
I could not have chain-smoked you could not have chain-smoked he could not have chain-smoked we could not have chain-smoked you could not have chain-smoked they could not have chain-smoked	I could not have been chain-smoking you could not have been chain-smoking he could not have been chain-smoking we could not have been chain-smoking you could not have been chain-smoking they could not have been chain-smoking

Interrogative form

Simple form	V-ing form
could I chain-smoke? could you chain-smoke? could he chain-smoke? could we chain-smoke? could you chain-smoke? could they chain-smoke?	could I be chain-smoking? could you be chain-smoking? could he be chain-smoking? could we be chain-smoking? could you be chain-smoking? could they be chain-smoking?
Perfect	V-ing perfect
could I have chain-smoked? could you have chain-smoked? could he have chain-smoked? could we have chain-smoked? could you have chain-smoked? could they have chain-smoked?	could I have been chain-smoking? could you have been chain-smoking? could he have been chain-smoking? could we have been chain-smoking? could you have been chain-smoking? could they have been chain-smoking?

Interro-negative form

Simple form	V-ing form
could I not chain-smoke? could you not chain-smoke? could he not chain-smoke? could we not chain-smoke? could you not chain-smoke? could they not chain-smoke?	could I not be chain-smoking? could you not be chain-smoking? could he not be chain-smoking? could we not be chain-smoking? could you not be chain-smoking? could they not be chain-smoking?
Perfect	V-ing perfect
could I not have chain-smoked? could you not have chain-smoked? could he not have chain-smoked? could we not have chain-smoked? could you not have chain-smoked? could they not have chain-smoked?	could I not have been chain-smoking? could you not have been chain-smoking? could he not have been chain-smoking? could we not have been chain-smoking? could you not have been chain-smoking? could they not have been chain-smoking?