must drain
Regular verb: drain - drained- drained

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must drain
you must drain
she must drain
we must drain
you must drain
they must drain 	I must be draining
you must be draining
she must be draining
we must be draining
you must be draining
they must be draining	I must have drained
you must have drained
she 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
she must have been draining
we must have been draining
you must have been draining
they must have been draining	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mustn't drain
you mustn't drain
she 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
she 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
she 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
she mustn't have been draining
we mustn't have been draining
you mustn't have been draining
they mustn't have been draining	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I drain?
must you drain?
must she drain?
must we drain?
must you drain?
must they drain? 	must I be draining?
must you be draining?
must she be draining?
must we be draining?
must you be draining?
must they be draining? 	must I have drained?
must you have drained?
must she 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 she have been draining?
must we have been draining?
must you have been draining?
must they have been draining? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mustn't I drain?
mustn't you drain?
mustn't she 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 she 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 she 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 she have been draining?
mustn't we have been draining?
mustn't you have been draining?
mustn't they have been draining?