must lark
Regular verb: lark - larked- larked

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must lark
you must lark
he must lark
we must lark
you must lark
they must lark 	I must be larking
you must be larking
he must be larking
we must be larking
you must be larking
they must be larking	I must have larked
you must have larked
he must have larked
we must have larked
you must have larked
they must have larked	I must have been larking
you must have been larking
he must have been larking
we must have been larking
you must have been larking
they must have been larking	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mustn't lark
you mustn't lark
he mustn't lark
we mustn't lark
you mustn't lark
they mustn't lark 	I mustn't be larking
you mustn't be larking
he mustn't be larking
we mustn't be larking
you mustn't be larking
they mustn't be larking	I mustn't have larked
you mustn't have larked
he mustn't have larked
we mustn't have larked
you mustn't have larked
they mustn't have larked	I mustn't have been larking
you mustn't have been larking
he mustn't have been larking
we mustn't have been larking
you mustn't have been larking
they mustn't have been larking	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I lark?
must you lark?
must he lark?
must we lark?
must you lark?
must they lark? 	must I be larking?
must you be larking?
must he be larking?
must we be larking?
must you be larking?
must they be larking? 	must I have larked?
must you have larked?
must he have larked?
must we have larked?
must you have larked?
must they have larked? 	must I have been larking?
must you have been larking?
must he have been larking?
must we have been larking?
must you have been larking?
must they have been larking? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mustn't I lark?
mustn't you lark?
mustn't he lark?
mustn't we lark?
mustn't you lark?
mustn't they lark? 	mustn't I be larking?
mustn't you be larking?
mustn't he be larking?
mustn't we be larking?
mustn't you be larking?
mustn't they be larking? 	mustn't I have larked?
mustn't you have larked?
mustn't he have larked?
mustn't we have larked?
mustn't you have larked?
mustn't they have larked? 	mustn't I have been larking?
mustn't you have been larking?
mustn't he have been larking?
mustn't we have been larking?
mustn't you have been larking?
mustn't they have been larking?