must lie
Irregular verb: lie - lay- lain

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must lie
you must lie
she must lie
we must lie
you must lie
they must lie 	I must be lying
you must be lying
she must be lying
we must be lying
you must be lying
they must be lying	I must have lain
you must have lain
she must have lain
we must have lain
you must have lain
they must have lain	I must have been lying
you must have been lying
she must have been lying
we must have been lying
you must have been lying
they must have been lying	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mustn't lie
you mustn't lie
she mustn't lie
we mustn't lie
you mustn't lie
they mustn't lie 	I mustn't be lying
you mustn't be lying
she mustn't be lying
we mustn't be lying
you mustn't be lying
they mustn't be lying	I mustn't have lain
you mustn't have lain
she mustn't have lain
we mustn't have lain
you mustn't have lain
they mustn't have lain	I mustn't have been lying
you mustn't have been lying
she mustn't have been lying
we mustn't have been lying
you mustn't have been lying
they mustn't have been lying	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I lie?
must you lie?
must she lie?
must we lie?
must you lie?
must they lie? 	must I be lying?
must you be lying?
must she be lying?
must we be lying?
must you be lying?
must they be lying? 	must I have lain?
must you have lain?
must she have lain?
must we have lain?
must you have lain?
must they have lain? 	must I have been lying?
must you have been lying?
must she have been lying?
must we have been lying?
must you have been lying?
must they have been lying? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mustn't I lie?
mustn't you lie?
mustn't she lie?
mustn't we lie?
mustn't you lie?
mustn't they lie? 	mustn't I be lying?
mustn't you be lying?
mustn't she be lying?
mustn't we be lying?
mustn't you be lying?
mustn't they be lying? 	mustn't I have lain?
mustn't you have lain?
mustn't she have lain?
mustn't we have lain?
mustn't you have lain?
mustn't they have lain? 	mustn't I have been lying?
mustn't you have been lying?
mustn't she have been lying?
mustn't we have been lying?
mustn't you have been lying?
mustn't they have been lying?