must pet
Regular verb: pet - petted- petted

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must pet
you must pet
she must pet
we must pet
you must pet
they must pet 	I must be petting
you must be petting
she must be petting
we must be petting
you must be petting
they must be petting	I must have petted
you must have petted
she must have petted
we must have petted
you must have petted
they must have petted	I must have been petting
you must have been petting
she must have been petting
we must have been petting
you must have been petting
they must have been petting	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mustn't pet
you mustn't pet
she mustn't pet
we mustn't pet
you mustn't pet
they mustn't pet 	I mustn't be petting
you mustn't be petting
she mustn't be petting
we mustn't be petting
you mustn't be petting
they mustn't be petting	I mustn't have petted
you mustn't have petted
she mustn't have petted
we mustn't have petted
you mustn't have petted
they mustn't have petted	I mustn't have been petting
you mustn't have been petting
she mustn't have been petting
we mustn't have been petting
you mustn't have been petting
they mustn't have been petting	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I pet?
must you pet?
must she pet?
must we pet?
must you pet?
must they pet? 	must I be petting?
must you be petting?
must she be petting?
must we be petting?
must you be petting?
must they be petting? 	must I have petted?
must you have petted?
must she have petted?
must we have petted?
must you have petted?
must they have petted? 	must I have been petting?
must you have been petting?
must she have been petting?
must we have been petting?
must you have been petting?
must they have been petting? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mustn't I pet?
mustn't you pet?
mustn't she pet?
mustn't we pet?
mustn't you pet?
mustn't they pet? 	mustn't I be petting?
mustn't you be petting?
mustn't she be petting?
mustn't we be petting?
mustn't you be petting?
mustn't they be petting? 	mustn't I have petted?
mustn't you have petted?
mustn't she have petted?
mustn't we have petted?
mustn't you have petted?
mustn't they have petted? 	mustn't I have been petting?
mustn't you have been petting?
mustn't she have been petting?
mustn't we have been petting?
mustn't you have been petting?
mustn't they have been petting?