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 must not yank
you must not yank
he must not yank
we must not yank
you must not yank
they must not yank 	I must not be yanking
you must not be yanking
he must not be yanking
we must not be yanking
you must not be yanking
they must not be yanking	I must not have yanked
you must not have yanked
he must not have yanked
we must not have yanked
you must not have yanked
they must not have yanked	I must not have been yanking
you must not have been yanking
he must not have been yanking
we must not have been yanking
you must not have been yanking
they must not 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 	
must I not yank?
must you not yank?
must he not yank?
must we not yank?
must you not yank?
must they not yank? 	must I not be yanking?
must you not be yanking?
must he not be yanking?
must we not be yanking?
must you not be yanking?
must they not be yanking? 	must I not have yanked?
must you not have yanked?
must he not have yanked?
must we not have yanked?
must you not have yanked?
must they not have yanked? 	must I not have been yanking?
must you not have been yanking?
must he not have been yanking?
must we not have been yanking?
must you not have been yanking?
must they not have been yanking?