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