must pipe
Verbo regular: pipe - piped- piped

Afirmação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I must pipe
you must pipe
she must pipe
we must pipe
you must pipe
they must pipe 	I must be piping
you must be piping
she must be piping
we must be piping
you must be piping
they must be piping	I must have piped
you must have piped
she 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
she must have been piping
we must have been piping
you must have been piping
they must have been piping	

Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I must not pipe
you must not pipe
she 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
she 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
she 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
she must not have been piping
we must not have been piping
you must not have been piping
they must not have been piping	

Forma interrogativa 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
must I pipe?
must you pipe?
must she pipe?
must we pipe?
must you pipe?
must they pipe? 	must I be piping?
must you be piping?
must she be piping?
must we be piping?
must you be piping?
must they be piping? 	must I have piped?
must you have piped?
must she 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 she have been piping?
must we have been piping?
must you have been piping?
must they have been piping? 	

Forma interro-Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
must I not pipe?
must you not pipe?
must she 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 she 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 she 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 she not have been piping?
must we not have been piping?
must you not have been piping?
must they not have been piping?