must drain
Verbo regular: drain - drained- drained

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I must drain
you must drain
he must drain
we must drain
you must drain
they must drain 	I must be draining
you must be draining
he must be draining
we must be draining
you must be draining
they must be draining	I must have drained
you must have drained
he must have drained
we must have drained
you must have drained
they must have drained	I must have been draining
you must have been draining
he must have been draining
we must have been draining
you must have been draining
they must have been draining	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I mustn't drain
you mustn't drain
he mustn't drain
we mustn't drain
you mustn't drain
they mustn't drain 	I mustn't be draining
you mustn't be draining
he mustn't be draining
we mustn't be draining
you mustn't be draining
they mustn't be draining	I mustn't have drained
you mustn't have drained
he mustn't have drained
we mustn't have drained
you mustn't have drained
they mustn't have drained	I mustn't have been draining
you mustn't have been draining
he mustn't have been draining
we mustn't have been draining
you mustn't have been draining
they mustn't have been draining	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
must I drain?
must you drain?
must he drain?
must we drain?
must you drain?
must they drain? 	must I be draining?
must you be draining?
must he be draining?
must we be draining?
must you be draining?
must they be draining? 	must I have drained?
must you have drained?
must he have drained?
must we have drained?
must you have drained?
must they have drained? 	must I have been draining?
must you have been draining?
must he have been draining?
must we have been draining?
must you have been draining?
must they have been draining? 	

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
mustn't I drain?
mustn't you drain?
mustn't he drain?
mustn't we drain?
mustn't you drain?
mustn't they drain? 	mustn't I be draining?
mustn't you be draining?
mustn't he be draining?
mustn't we be draining?
mustn't you be draining?
mustn't they be draining? 	mustn't I have drained?
mustn't you have drained?
mustn't he have drained?
mustn't we have drained?
mustn't you have drained?
mustn't they have drained? 	mustn't I have been draining?
mustn't you have been draining?
mustn't he have been draining?
mustn't we have been draining?
mustn't you have been draining?
mustn't they have been draining?