must tweak
Regular verb: tweak - tweaked- tweaked

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must tweak
you must tweak
he must tweak
we must tweak
you must tweak
they must tweak 	I must be tweaking
you must be tweaking
he must be tweaking
we must be tweaking
you must be tweaking
they must be tweaking	I must have tweaked
you must have tweaked
he must have tweaked
we must have tweaked
you must have tweaked
they must have tweaked	I must have been tweaking
you must have been tweaking
he must have been tweaking
we must have been tweaking
you must have been tweaking
they must have been tweaking	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mustn't tweak
you mustn't tweak
he mustn't tweak
we mustn't tweak
you mustn't tweak
they mustn't tweak 	I mustn't be tweaking
you mustn't be tweaking
he mustn't be tweaking
we mustn't be tweaking
you mustn't be tweaking
they mustn't be tweaking	I mustn't have tweaked
you mustn't have tweaked
he mustn't have tweaked
we mustn't have tweaked
you mustn't have tweaked
they mustn't have tweaked	I mustn't have been tweaking
you mustn't have been tweaking
he mustn't have been tweaking
we mustn't have been tweaking
you mustn't have been tweaking
they mustn't have been tweaking	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I tweak?
must you tweak?
must he tweak?
must we tweak?
must you tweak?
must they tweak? 	must I be tweaking?
must you be tweaking?
must he be tweaking?
must we be tweaking?
must you be tweaking?
must they be tweaking? 	must I have tweaked?
must you have tweaked?
must he have tweaked?
must we have tweaked?
must you have tweaked?
must they have tweaked? 	must I have been tweaking?
must you have been tweaking?
must he have been tweaking?
must we have been tweaking?
must you have been tweaking?
must they have been tweaking? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mustn't I tweak?
mustn't you tweak?
mustn't he tweak?
mustn't we tweak?
mustn't you tweak?
mustn't they tweak? 	mustn't I be tweaking?
mustn't you be tweaking?
mustn't he be tweaking?
mustn't we be tweaking?
mustn't you be tweaking?
mustn't they be tweaking? 	mustn't I have tweaked?
mustn't you have tweaked?
mustn't he have tweaked?
mustn't we have tweaked?
mustn't you have tweaked?
mustn't they have tweaked? 	mustn't I have been tweaking?
mustn't you have been tweaking?
mustn't he have been tweaking?
mustn't we have been tweaking?
mustn't you have been tweaking?
mustn't they have been tweaking?