must piece
Verbo regular: piece - pieced- pieced

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I must piece
you must piece
he must piece
we must piece
you must piece
they must piece 	I must be piecing
you must be piecing
he must be piecing
we must be piecing
you must be piecing
they must be piecing	I must have pieced
you must have pieced
he must have pieced
we must have pieced
you must have pieced
they must have pieced	I must have been piecing
you must have been piecing
he must have been piecing
we must have been piecing
you must have been piecing
they must have been piecing	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I must not piece
you must not piece
he must not piece
we must not piece
you must not piece
they must not piece 	I must not be piecing
you must not be piecing
he must not be piecing
we must not be piecing
you must not be piecing
they must not be piecing	I must not have pieced
you must not have pieced
he must not have pieced
we must not have pieced
you must not have pieced
they must not have pieced	I must not have been piecing
you must not have been piecing
he must not have been piecing
we must not have been piecing
you must not have been piecing
they must not have been piecing	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
must I piece?
must you piece?
must he piece?
must we piece?
must you piece?
must they piece? 	must I be piecing?
must you be piecing?
must he be piecing?
must we be piecing?
must you be piecing?
must they be piecing? 	must I have pieced?
must you have pieced?
must he have pieced?
must we have pieced?
must you have pieced?
must they have pieced? 	must I have been piecing?
must you have been piecing?
must he have been piecing?
must we have been piecing?
must you have been piecing?
must they have been piecing? 	

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
must I not piece?
must you not piece?
must he not piece?
must we not piece?
must you not piece?
must they not piece? 	must I not be piecing?
must you not be piecing?
must he not be piecing?
must we not be piecing?
must you not be piecing?
must they not be piecing? 	must I not have pieced?
must you not have pieced?
must he not have pieced?
must we not have pieced?
must you not have pieced?
must they not have pieced? 	must I not have been piecing?
must you not have been piecing?
must he not have been piecing?
must we not have been piecing?
must you not have been piecing?
must they not have been piecing?