English verb conjugation
MUST PUZZLE

Regular verb: puzzle - puzzled - puzzled

Affirmation

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

Negation

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

Interrogative form

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

Interro-negative form

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