must instrument
Regular verb: instrument - instrumented- instrumented

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must instrument
you must instrument
she must instrument
we must instrument
you must instrument
they must instrument 	I must be instrumenting
you must be instrumenting
she must be instrumenting
we must be instrumenting
you must be instrumenting
they must be instrumenting	I must have instrumented
you must have instrumented
she must have instrumented
we must have instrumented
you must have instrumented
they must have instrumented	I must have been instrumenting
you must have been instrumenting
she must have been instrumenting
we must have been instrumenting
you must have been instrumenting
they must have been instrumenting	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mustn't instrument
you mustn't instrument
she mustn't instrument
we mustn't instrument
you mustn't instrument
they mustn't instrument 	I mustn't be instrumenting
you mustn't be instrumenting
she mustn't be instrumenting
we mustn't be instrumenting
you mustn't be instrumenting
they mustn't be instrumenting	I mustn't have instrumented
you mustn't have instrumented
she mustn't have instrumented
we mustn't have instrumented
you mustn't have instrumented
they mustn't have instrumented	I mustn't have been instrumenting
you mustn't have been instrumenting
she mustn't have been instrumenting
we mustn't have been instrumenting
you mustn't have been instrumenting
they mustn't have been instrumenting	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I instrument?
must you instrument?
must she instrument?
must we instrument?
must you instrument?
must they instrument? 	must I be instrumenting?
must you be instrumenting?
must she be instrumenting?
must we be instrumenting?
must you be instrumenting?
must they be instrumenting? 	must I have instrumented?
must you have instrumented?
must she have instrumented?
must we have instrumented?
must you have instrumented?
must they have instrumented? 	must I have been instrumenting?
must you have been instrumenting?
must she have been instrumenting?
must we have been instrumenting?
must you have been instrumenting?
must they have been instrumenting? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mustn't I instrument?
mustn't you instrument?
mustn't she instrument?
mustn't we instrument?
mustn't you instrument?
mustn't they instrument? 	mustn't I be instrumenting?
mustn't you be instrumenting?
mustn't she be instrumenting?
mustn't we be instrumenting?
mustn't you be instrumenting?
mustn't they be instrumenting? 	mustn't I have instrumented?
mustn't you have instrumented?
mustn't she have instrumented?
mustn't we have instrumented?
mustn't you have instrumented?
mustn't they have instrumented? 	mustn't I have been instrumenting?
mustn't you have been instrumenting?
mustn't she have been instrumenting?
mustn't we have been instrumenting?
mustn't you have been instrumenting?
mustn't they have been instrumenting?