must puzzle
Regular verb: puzzle - puzzled- puzzled

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must puzzle
you must puzzle
she must puzzle
we must puzzle
you must puzzle
they must puzzle 	I must be puzzling
you must be puzzling
she must be puzzling
we must be puzzling
you must be puzzling
they must be puzzling	I must have puzzled
you must have puzzled
she 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
she 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 	Perfect 	V-ing perfect 	
I mustn't puzzle
you mustn't puzzle
she 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
she mustn't be puzzling
we mustn't be puzzling
you mustn't be puzzling
they mustn't be puzzling	I mustn't have puzzled
you mustn't have puzzled
she 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
she 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 	Perfect 	V-ing perfect 	
must I puzzle?
must you puzzle?
must she puzzle?
must we puzzle?
must you puzzle?
must they puzzle? 	must I be puzzling?
must you be puzzling?
must she be puzzling?
must we be puzzling?
must you be puzzling?
must they be puzzling? 	must I have puzzled?
must you have puzzled?
must she 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 she 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 	Perfect 	V-ing perfect 	
mustn't I puzzle?
mustn't you puzzle?
mustn't she 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 she be puzzling?
mustn't we be puzzling?
mustn't you be puzzling?
mustn't they be puzzling? 	mustn't I have puzzled?
mustn't you have puzzled?
mustn't she 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 she have been puzzling?
mustn't we have been puzzling?
mustn't you have been puzzling?
mustn't they have been puzzling?