must pipe
Verbe régulier : pipe - piped- piped
Traduction française : acheminer par tuyau - jouer de la cornemuse 

Affirmation 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
I must pipe
you must pipe
he must pipe
we must pipe
you must pipe
they must pipe 	I must be piping
you must be piping
he must be piping
we must be piping
you must be piping
they must be piping	I must have piped
you must have piped
he must have piped
we must have piped
you must have piped
they must have piped	I must have been piping
you must have been piping
he must have been piping
we must have been piping
you must have been piping
they must have been piping	

Négation 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
I must not pipe
you must not pipe
he must not pipe
we must not pipe
you must not pipe
they must not pipe 	I must not be piping
you must not be piping
he must not be piping
we must not be piping
you must not be piping
they must not be piping	I must not have piped
you must not have piped
he must not have piped
we must not have piped
you must not have piped
they must not have piped	I must not have been piping
you must not have been piping
he must not have been piping
we must not have been piping
you must not have been piping
they must not have been piping	

Forme interrogative 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
must I pipe?
must you pipe?
must he pipe?
must we pipe?
must you pipe?
must they pipe? 	must I be piping?
must you be piping?
must he be piping?
must we be piping?
must you be piping?
must they be piping? 	must I have piped?
must you have piped?
must he have piped?
must we have piped?
must you have piped?
must they have piped? 	must I have been piping?
must you have been piping?
must he have been piping?
must we have been piping?
must you have been piping?
must they have been piping? 	

Forme interro-négative 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
must I not pipe?
must you not pipe?
must he not pipe?
must we not pipe?
must you not pipe?
must they not pipe? 	must I not be piping?
must you not be piping?
must he not be piping?
must we not be piping?
must you not be piping?
must they not be piping? 	must I not have piped?
must you not have piped?
must he not have piped?
must we not have piped?
must you not have piped?
must they not have piped? 	must I not have been piping?
must you not have been piping?
must he not have been piping?
must we not have been piping?
must you not have been piping?
must they not have been piping?