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 must not lark
you must not lark
he must not lark
we must not lark
you must not lark
they must not lark 	I must not be larking
you must not be larking
he must not be larking
we must not be larking
you must not be larking
they must not be larking	I must not have larked
you must not have larked
he must not have larked
we must not have larked
you must not have larked
they must not have larked	I must not have been larking
you must not have been larking
he must not have been larking
we must not have been larking
you must not have been larking
they must not 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 	
must I not lark?
must you not lark?
must he not lark?
must we not lark?
must you not lark?
must they not lark? 	must I not be larking?
must you not be larking?
must he not be larking?
must we not be larking?
must you not be larking?
must they not be larking? 	must I not have larked?
must you not have larked?
must he not have larked?
must we not have larked?
must you not have larked?
must they not have larked? 	must I not have been larking?
must you not have been larking?
must he not have been larking?
must we not have been larking?
must you not have been larking?
must they not have been larking?