must sinter
Regular verb: sinter - sintered- sintered

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must sinter
you must sinter
she must sinter
we must sinter
you must sinter
they must sinter 	I must be sintering
you must be sintering
she must be sintering
we must be sintering
you must be sintering
they must be sintering	I must have sintered
you must have sintered
she must have sintered
we must have sintered
you must have sintered
they must have sintered	I must have been sintering
you must have been sintering
she must have been sintering
we must have been sintering
you must have been sintering
they must have been sintering	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mustn't sinter
you mustn't sinter
she mustn't sinter
we mustn't sinter
you mustn't sinter
they mustn't sinter 	I mustn't be sintering
you mustn't be sintering
she mustn't be sintering
we mustn't be sintering
you mustn't be sintering
they mustn't be sintering	I mustn't have sintered
you mustn't have sintered
she mustn't have sintered
we mustn't have sintered
you mustn't have sintered
they mustn't have sintered	I mustn't have been sintering
you mustn't have been sintering
she mustn't have been sintering
we mustn't have been sintering
you mustn't have been sintering
they mustn't have been sintering	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I sinter?
must you sinter?
must she sinter?
must we sinter?
must you sinter?
must they sinter? 	must I be sintering?
must you be sintering?
must she be sintering?
must we be sintering?
must you be sintering?
must they be sintering? 	must I have sintered?
must you have sintered?
must she have sintered?
must we have sintered?
must you have sintered?
must they have sintered? 	must I have been sintering?
must you have been sintering?
must she have been sintering?
must we have been sintering?
must you have been sintering?
must they have been sintering? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mustn't I sinter?
mustn't you sinter?
mustn't she sinter?
mustn't we sinter?
mustn't you sinter?
mustn't they sinter? 	mustn't I be sintering?
mustn't you be sintering?
mustn't she be sintering?
mustn't we be sintering?
mustn't you be sintering?
mustn't they be sintering? 	mustn't I have sintered?
mustn't you have sintered?
mustn't she have sintered?
mustn't we have sintered?
mustn't you have sintered?
mustn't they have sintered? 	mustn't I have been sintering?
mustn't you have been sintering?
mustn't she have been sintering?
mustn't we have been sintering?
mustn't you have been sintering?
mustn't they have been sintering?