must yank
Regular verb: yank - yanked- yanked

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must yank
you must yank
he must yank
we must yank
you must yank
they must yank 	I must be yanking
you must be yanking
he must be yanking
we must be yanking
you must be yanking
they must be yanking	I must have yanked
you must have yanked
he must have yanked
we must have yanked
you must have yanked
they must have yanked	I must have been yanking
you must have been yanking
he must have been yanking
we must have been yanking
you must have been yanking
they must have been yanking	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mustn't yank
you mustn't yank
he mustn't yank
we mustn't yank
you mustn't yank
they mustn't yank 	I mustn't be yanking
you mustn't be yanking
he mustn't be yanking
we mustn't be yanking
you mustn't be yanking
they mustn't be yanking	I mustn't have yanked
you mustn't have yanked
he mustn't have yanked
we mustn't have yanked
you mustn't have yanked
they mustn't have yanked	I mustn't have been yanking
you mustn't have been yanking
he mustn't have been yanking
we mustn't have been yanking
you mustn't have been yanking
they mustn't have been yanking	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I yank?
must you yank?
must he yank?
must we yank?
must you yank?
must they yank? 	must I be yanking?
must you be yanking?
must he be yanking?
must we be yanking?
must you be yanking?
must they be yanking? 	must I have yanked?
must you have yanked?
must he have yanked?
must we have yanked?
must you have yanked?
must they have yanked? 	must I have been yanking?
must you have been yanking?
must he have been yanking?
must we have been yanking?
must you have been yanking?
must they have been yanking? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mustn't I yank?
mustn't you yank?
mustn't he yank?
mustn't we yank?
mustn't you yank?
mustn't they yank? 	mustn't I be yanking?
mustn't you be yanking?
mustn't he be yanking?
mustn't we be yanking?
mustn't you be yanking?
mustn't they be yanking? 	mustn't I have yanked?
mustn't you have yanked?
mustn't he have yanked?
mustn't we have yanked?
mustn't you have yanked?
mustn't they have yanked? 	mustn't I have been yanking?
mustn't you have been yanking?
mustn't he have been yanking?
mustn't we have been yanking?
mustn't you have been yanking?
mustn't they have been yanking?