must outsing
Irregular verb: outsing - outsang- outsung

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must outsing
you must outsing
she must outsing
we must outsing
you must outsing
they must outsing 	I must be outsinging
you must be outsinging
she must be outsinging
we must be outsinging
you must be outsinging
they must be outsinging	I must have outsung
you must have outsung
she must have outsung
we must have outsung
you must have outsung
they must have outsung	I must have been outsinging
you must have been outsinging
she must have been outsinging
we must have been outsinging
you must have been outsinging
they must have been outsinging	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mustn't outsing
you mustn't outsing
she mustn't outsing
we mustn't outsing
you mustn't outsing
they mustn't outsing 	I mustn't be outsinging
you mustn't be outsinging
she mustn't be outsinging
we mustn't be outsinging
you mustn't be outsinging
they mustn't be outsinging	I mustn't have outsung
you mustn't have outsung
she mustn't have outsung
we mustn't have outsung
you mustn't have outsung
they mustn't have outsung	I mustn't have been outsinging
you mustn't have been outsinging
she mustn't have been outsinging
we mustn't have been outsinging
you mustn't have been outsinging
they mustn't have been outsinging	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I outsing?
must you outsing?
must she outsing?
must we outsing?
must you outsing?
must they outsing? 	must I be outsinging?
must you be outsinging?
must she be outsinging?
must we be outsinging?
must you be outsinging?
must they be outsinging? 	must I have outsung?
must you have outsung?
must she have outsung?
must we have outsung?
must you have outsung?
must they have outsung? 	must I have been outsinging?
must you have been outsinging?
must she have been outsinging?
must we have been outsinging?
must you have been outsinging?
must they have been outsinging? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mustn't I outsing?
mustn't you outsing?
mustn't she outsing?
mustn't we outsing?
mustn't you outsing?
mustn't they outsing? 	mustn't I be outsinging?
mustn't you be outsinging?
mustn't she be outsinging?
mustn't we be outsinging?
mustn't you be outsinging?
mustn't they be outsinging? 	mustn't I have outsung?
mustn't you have outsung?
mustn't she have outsung?
mustn't we have outsung?
mustn't you have outsung?
mustn't they have outsung? 	mustn't I have been outsinging?
mustn't you have been outsinging?
mustn't she have been outsinging?
mustn't we have been outsinging?
mustn't you have been outsinging?
mustn't they have been outsinging?