must twine
Regular verb: twine - twined- twined

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must twine
you must twine
he must twine
we must twine
you must twine
they must twine 	I must be twining
you must be twining
he must be twining
we must be twining
you must be twining
they must be twining	I must have twined
you must have twined
he must have twined
we must have twined
you must have twined
they must have twined	I must have been twining
you must have been twining
he must have been twining
we must have been twining
you must have been twining
they must have been twining	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mustn't twine
you mustn't twine
he mustn't twine
we mustn't twine
you mustn't twine
they mustn't twine 	I mustn't be twining
you mustn't be twining
he mustn't be twining
we mustn't be twining
you mustn't be twining
they mustn't be twining	I mustn't have twined
you mustn't have twined
he mustn't have twined
we mustn't have twined
you mustn't have twined
they mustn't have twined	I mustn't have been twining
you mustn't have been twining
he mustn't have been twining
we mustn't have been twining
you mustn't have been twining
they mustn't have been twining	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I twine?
must you twine?
must he twine?
must we twine?
must you twine?
must they twine? 	must I be twining?
must you be twining?
must he be twining?
must we be twining?
must you be twining?
must they be twining? 	must I have twined?
must you have twined?
must he have twined?
must we have twined?
must you have twined?
must they have twined? 	must I have been twining?
must you have been twining?
must he have been twining?
must we have been twining?
must you have been twining?
must they have been twining? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mustn't I twine?
mustn't you twine?
mustn't he twine?
mustn't we twine?
mustn't you twine?
mustn't they twine? 	mustn't I be twining?
mustn't you be twining?
mustn't he be twining?
mustn't we be twining?
mustn't you be twining?
mustn't they be twining? 	mustn't I have twined?
mustn't you have twined?
mustn't he have twined?
mustn't we have twined?
mustn't you have twined?
mustn't they have twined? 	mustn't I have been twining?
mustn't you have been twining?
mustn't he have been twining?
mustn't we have been twining?
mustn't you have been twining?
mustn't they have been twining?