must shake
Irregular verb: shake - shook- shaken

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must shake
you must shake
he must shake
we must shake
you must shake
they must shake 	I must be shaking
you must be shaking
he must be shaking
we must be shaking
you must be shaking
they must be shaking	I must have shaken
you must have shaken
he must have shaken
we must have shaken
you must have shaken
they must have shaken	I must have been shaking
you must have been shaking
he must have been shaking
we must have been shaking
you must have been shaking
they must have been shaking	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mustn't shake
you mustn't shake
he mustn't shake
we mustn't shake
you mustn't shake
they mustn't shake 	I mustn't be shaking
you mustn't be shaking
he mustn't be shaking
we mustn't be shaking
you mustn't be shaking
they mustn't be shaking	I mustn't have shaken
you mustn't have shaken
he mustn't have shaken
we mustn't have shaken
you mustn't have shaken
they mustn't have shaken	I mustn't have been shaking
you mustn't have been shaking
he mustn't have been shaking
we mustn't have been shaking
you mustn't have been shaking
they mustn't have been shaking	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I shake?
must you shake?
must he shake?
must we shake?
must you shake?
must they shake? 	must I be shaking?
must you be shaking?
must he be shaking?
must we be shaking?
must you be shaking?
must they be shaking? 	must I have shaken?
must you have shaken?
must he have shaken?
must we have shaken?
must you have shaken?
must they have shaken? 	must I have been shaking?
must you have been shaking?
must he have been shaking?
must we have been shaking?
must you have been shaking?
must they have been shaking? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mustn't I shake?
mustn't you shake?
mustn't he shake?
mustn't we shake?
mustn't you shake?
mustn't they shake? 	mustn't I be shaking?
mustn't you be shaking?
mustn't he be shaking?
mustn't we be shaking?
mustn't you be shaking?
mustn't they be shaking? 	mustn't I have shaken?
mustn't you have shaken?
mustn't he have shaken?
mustn't we have shaken?
mustn't you have shaken?
mustn't they have shaken? 	mustn't I have been shaking?
mustn't you have been shaking?
mustn't he have been shaking?
mustn't we have been shaking?
mustn't you have been shaking?
mustn't they have been shaking?