must switch
Regular verb: switch - switched- switched

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must switch
you must switch
he must switch
we must switch
you must switch
they must switch 	I must be switching
you must be switching
he must be switching
we must be switching
you must be switching
they must be switching	I must have switched
you must have switched
he must have switched
we must have switched
you must have switched
they must have switched	I must have been switching
you must have been switching
he must have been switching
we must have been switching
you must have been switching
they must have been switching	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mustn't switch
you mustn't switch
he mustn't switch
we mustn't switch
you mustn't switch
they mustn't switch 	I mustn't be switching
you mustn't be switching
he mustn't be switching
we mustn't be switching
you mustn't be switching
they mustn't be switching	I mustn't have switched
you mustn't have switched
he mustn't have switched
we mustn't have switched
you mustn't have switched
they mustn't have switched	I mustn't have been switching
you mustn't have been switching
he mustn't have been switching
we mustn't have been switching
you mustn't have been switching
they mustn't have been switching	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I switch?
must you switch?
must he switch?
must we switch?
must you switch?
must they switch? 	must I be switching?
must you be switching?
must he be switching?
must we be switching?
must you be switching?
must they be switching? 	must I have switched?
must you have switched?
must he have switched?
must we have switched?
must you have switched?
must they have switched? 	must I have been switching?
must you have been switching?
must he have been switching?
must we have been switching?
must you have been switching?
must they have been switching? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mustn't I switch?
mustn't you switch?
mustn't he switch?
mustn't we switch?
mustn't you switch?
mustn't they switch? 	mustn't I be switching?
mustn't you be switching?
mustn't he be switching?
mustn't we be switching?
mustn't you be switching?
mustn't they be switching? 	mustn't I have switched?
mustn't you have switched?
mustn't he have switched?
mustn't we have switched?
mustn't you have switched?
mustn't they have switched? 	mustn't I have been switching?
mustn't you have been switching?
mustn't he have been switching?
mustn't we have been switching?
mustn't you have been switching?
mustn't they have been switching?