must signal
Regular verb: signal - signalled- signalled

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must signal
you must signal
he must signal
we must signal
you must signal
they must signal 	I must be signalling
you must be signalling
he must be signalling
we must be signalling
you must be signalling
they must be signalling	I must have signalled
you must have signalled
he must have signalled
we must have signalled
you must have signalled
they must have signalled	I must have been signalling
you must have been signalling
he must have been signalling
we must have been signalling
you must have been signalling
they must have been signalling	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must not signal
you must not signal
he must not signal
we must not signal
you must not signal
they must not signal 	I must not be signalling
you must not be signalling
he must not be signalling
we must not be signalling
you must not be signalling
they must not be signalling	I must not have signalled
you must not have signalled
he must not have signalled
we must not have signalled
you must not have signalled
they must not have signalled	I must not have been signalling
you must not have been signalling
he must not have been signalling
we must not have been signalling
you must not have been signalling
they must not have been signalling	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I signal?
must you signal?
must he signal?
must we signal?
must you signal?
must they signal? 	must I be signalling?
must you be signalling?
must he be signalling?
must we be signalling?
must you be signalling?
must they be signalling? 	must I have signalled?
must you have signalled?
must he have signalled?
must we have signalled?
must you have signalled?
must they have signalled? 	must I have been signalling?
must you have been signalling?
must he have been signalling?
must we have been signalling?
must you have been signalling?
must they have been signalling? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I not signal?
must you not signal?
must he not signal?
must we not signal?
must you not signal?
must they not signal? 	must I not be signalling?
must you not be signalling?
must he not be signalling?
must we not be signalling?
must you not be signalling?
must they not be signalling? 	must I not have signalled?
must you not have signalled?
must he not have signalled?
must we not have signalled?
must you not have signalled?
must they not have signalled? 	must I not have been signalling?
must you not have been signalling?
must he not have been signalling?
must we not have been signalling?
must you not have been signalling?
must they not have been signalling?