must yap
Verbo regular: yap - yapped- yapped

Afirmação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I must yap
you must yap
he must yap
we must yap
you must yap
they must yap 	I must be yapping
you must be yapping
he must be yapping
we must be yapping
you must be yapping
they must be yapping	I must have yapped
you must have yapped
he must have yapped
we must have yapped
you must have yapped
they must have yapped	I must have been yapping
you must have been yapping
he must have been yapping
we must have been yapping
you must have been yapping
they must have been yapping	

Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I mustn't yap
you mustn't yap
he mustn't yap
we mustn't yap
you mustn't yap
they mustn't yap 	I mustn't be yapping
you mustn't be yapping
he mustn't be yapping
we mustn't be yapping
you mustn't be yapping
they mustn't be yapping	I mustn't have yapped
you mustn't have yapped
he mustn't have yapped
we mustn't have yapped
you mustn't have yapped
they mustn't have yapped	I mustn't have been yapping
you mustn't have been yapping
he mustn't have been yapping
we mustn't have been yapping
you mustn't have been yapping
they mustn't have been yapping	

Forma interrogativa 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
must I yap?
must you yap?
must he yap?
must we yap?
must you yap?
must they yap? 	must I be yapping?
must you be yapping?
must he be yapping?
must we be yapping?
must you be yapping?
must they be yapping? 	must I have yapped?
must you have yapped?
must he have yapped?
must we have yapped?
must you have yapped?
must they have yapped? 	must I have been yapping?
must you have been yapping?
must he have been yapping?
must we have been yapping?
must you have been yapping?
must they have been yapping? 	

Forma interro-Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
mustn't I yap?
mustn't you yap?
mustn't he yap?
mustn't we yap?
mustn't you yap?
mustn't they yap? 	mustn't I be yapping?
mustn't you be yapping?
mustn't he be yapping?
mustn't we be yapping?
mustn't you be yapping?
mustn't they be yapping? 	mustn't I have yapped?
mustn't you have yapped?
mustn't he have yapped?
mustn't we have yapped?
mustn't you have yapped?
mustn't they have yapped? 	mustn't I have been yapping?
mustn't you have been yapping?
mustn't he have been yapping?
mustn't we have been yapping?
mustn't you have been yapping?
mustn't they have been yapping?