must muddle
Verbo regular: muddle - muddled- muddled

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I must muddle
you must muddle
he must muddle
we must muddle
you must muddle
they must muddle 	I must be muddling
you must be muddling
he must be muddling
we must be muddling
you must be muddling
they must be muddling	I must have muddled
you must have muddled
he must have muddled
we must have muddled
you must have muddled
they must have muddled	I must have been muddling
you must have been muddling
he must have been muddling
we must have been muddling
you must have been muddling
they must have been muddling	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I mustn't muddle
you mustn't muddle
he mustn't muddle
we mustn't muddle
you mustn't muddle
they mustn't muddle 	I mustn't be muddling
you mustn't be muddling
he mustn't be muddling
we mustn't be muddling
you mustn't be muddling
they mustn't be muddling	I mustn't have muddled
you mustn't have muddled
he mustn't have muddled
we mustn't have muddled
you mustn't have muddled
they mustn't have muddled	I mustn't have been muddling
you mustn't have been muddling
he mustn't have been muddling
we mustn't have been muddling
you mustn't have been muddling
they mustn't have been muddling	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
must I muddle?
must you muddle?
must he muddle?
must we muddle?
must you muddle?
must they muddle? 	must I be muddling?
must you be muddling?
must he be muddling?
must we be muddling?
must you be muddling?
must they be muddling? 	must I have muddled?
must you have muddled?
must he have muddled?
must we have muddled?
must you have muddled?
must they have muddled? 	must I have been muddling?
must you have been muddling?
must he have been muddling?
must we have been muddling?
must you have been muddling?
must they have been muddling? 	

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
mustn't I muddle?
mustn't you muddle?
mustn't he muddle?
mustn't we muddle?
mustn't you muddle?
mustn't they muddle? 	mustn't I be muddling?
mustn't you be muddling?
mustn't he be muddling?
mustn't we be muddling?
mustn't you be muddling?
mustn't they be muddling? 	mustn't I have muddled?
mustn't you have muddled?
mustn't he have muddled?
mustn't we have muddled?
mustn't you have muddled?
mustn't they have muddled? 	mustn't I have been muddling?
mustn't you have been muddling?
mustn't he have been muddling?
mustn't we have been muddling?
mustn't you have been muddling?
mustn't they have been muddling?