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

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

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

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

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