must sling
Irregular verb: sling - slung- slung

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must sling
you must sling
he must sling
we must sling
you must sling
they must sling 	I must be slinging
you must be slinging
he must be slinging
we must be slinging
you must be slinging
they must be slinging	I must have slung
you must have slung
he must have slung
we must have slung
you must have slung
they must have slung	I must have been slinging
you must have been slinging
he must have been slinging
we must have been slinging
you must have been slinging
they must have been slinging	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mustn't sling
you mustn't sling
he mustn't sling
we mustn't sling
you mustn't sling
they mustn't sling 	I mustn't be slinging
you mustn't be slinging
he mustn't be slinging
we mustn't be slinging
you mustn't be slinging
they mustn't be slinging	I mustn't have slung
you mustn't have slung
he mustn't have slung
we mustn't have slung
you mustn't have slung
they mustn't have slung	I mustn't have been slinging
you mustn't have been slinging
he mustn't have been slinging
we mustn't have been slinging
you mustn't have been slinging
they mustn't have been slinging	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I sling?
must you sling?
must he sling?
must we sling?
must you sling?
must they sling? 	must I be slinging?
must you be slinging?
must he be slinging?
must we be slinging?
must you be slinging?
must they be slinging? 	must I have slung?
must you have slung?
must he have slung?
must we have slung?
must you have slung?
must they have slung? 	must I have been slinging?
must you have been slinging?
must he have been slinging?
must we have been slinging?
must you have been slinging?
must they have been slinging? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mustn't I sling?
mustn't you sling?
mustn't he sling?
mustn't we sling?
mustn't you sling?
mustn't they sling? 	mustn't I be slinging?
mustn't you be slinging?
mustn't he be slinging?
mustn't we be slinging?
mustn't you be slinging?
mustn't they be slinging? 	mustn't I have slung?
mustn't you have slung?
mustn't he have slung?
mustn't we have slung?
mustn't you have slung?
mustn't they have slung? 	mustn't I have been slinging?
mustn't you have been slinging?
mustn't he have been slinging?
mustn't we have been slinging?
mustn't you have been slinging?
mustn't they have been slinging?