must sting
Irregular verb: sting - stung- stung

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must sting
you must sting
she must sting
we must sting
you must sting
they must sting 	I must be stinging
you must be stinging
she must be stinging
we must be stinging
you must be stinging
they must be stinging	I must have stung
you must have stung
she must have stung
we must have stung
you must have stung
they must have stung	I must have been stinging
you must have been stinging
she must have been stinging
we must have been stinging
you must have been stinging
they must have been stinging	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mustn't sting
you mustn't sting
she mustn't sting
we mustn't sting
you mustn't sting
they mustn't sting 	I mustn't be stinging
you mustn't be stinging
she mustn't be stinging
we mustn't be stinging
you mustn't be stinging
they mustn't be stinging	I mustn't have stung
you mustn't have stung
she mustn't have stung
we mustn't have stung
you mustn't have stung
they mustn't have stung	I mustn't have been stinging
you mustn't have been stinging
she mustn't have been stinging
we mustn't have been stinging
you mustn't have been stinging
they mustn't have been stinging	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I sting?
must you sting?
must she sting?
must we sting?
must you sting?
must they sting? 	must I be stinging?
must you be stinging?
must she be stinging?
must we be stinging?
must you be stinging?
must they be stinging? 	must I have stung?
must you have stung?
must she have stung?
must we have stung?
must you have stung?
must they have stung? 	must I have been stinging?
must you have been stinging?
must she have been stinging?
must we have been stinging?
must you have been stinging?
must they have been stinging? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mustn't I sting?
mustn't you sting?
mustn't she sting?
mustn't we sting?
mustn't you sting?
mustn't they sting? 	mustn't I be stinging?
mustn't you be stinging?
mustn't she be stinging?
mustn't we be stinging?
mustn't you be stinging?
mustn't they be stinging? 	mustn't I have stung?
mustn't you have stung?
mustn't she have stung?
mustn't we have stung?
mustn't you have stung?
mustn't they have stung? 	mustn't I have been stinging?
mustn't you have been stinging?
mustn't she have been stinging?
mustn't we have been stinging?
mustn't you have been stinging?
mustn't they have been stinging?