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 must not switch
you must not switch
he must not switch
we must not switch
you must not switch
they must not switch 	I must not be switching
you must not be switching
he must not be switching
we must not be switching
you must not be switching
they must not be switching	I must not have switched
you must not have switched
he must not have switched
we must not have switched
you must not have switched
they must not have switched	I must not have been switching
you must not have been switching
he must not have been switching
we must not have been switching
you must not have been switching
they must not 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 	
must I not switch?
must you not switch?
must he not switch?
must we not switch?
must you not switch?
must they not switch? 	must I not be switching?
must you not be switching?
must he not be switching?
must we not be switching?
must you not be switching?
must they not be switching? 	must I not have switched?
must you not have switched?
must he not have switched?
must we not have switched?
must you not have switched?
must they not have switched? 	must I not have been switching?
must you not have been switching?
must he not have been switching?
must we not have been switching?
must you not have been switching?
must they not have been switching?