must engineer
Regular verb: engineer - engineered- engineered

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must engineer
you must engineer
she must engineer
we must engineer
you must engineer
they must engineer 	I must be engineering
you must be engineering
she must be engineering
we must be engineering
you must be engineering
they must be engineering	I must have engineered
you must have engineered
she must have engineered
we must have engineered
you must have engineered
they must have engineered	I must have been engineering
you must have been engineering
she must have been engineering
we must have been engineering
you must have been engineering
they must have been engineering	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mustn't engineer
you mustn't engineer
she mustn't engineer
we mustn't engineer
you mustn't engineer
they mustn't engineer 	I mustn't be engineering
you mustn't be engineering
she mustn't be engineering
we mustn't be engineering
you mustn't be engineering
they mustn't be engineering	I mustn't have engineered
you mustn't have engineered
she mustn't have engineered
we mustn't have engineered
you mustn't have engineered
they mustn't have engineered	I mustn't have been engineering
you mustn't have been engineering
she mustn't have been engineering
we mustn't have been engineering
you mustn't have been engineering
they mustn't have been engineering	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I engineer?
must you engineer?
must she engineer?
must we engineer?
must you engineer?
must they engineer? 	must I be engineering?
must you be engineering?
must she be engineering?
must we be engineering?
must you be engineering?
must they be engineering? 	must I have engineered?
must you have engineered?
must she have engineered?
must we have engineered?
must you have engineered?
must they have engineered? 	must I have been engineering?
must you have been engineering?
must she have been engineering?
must we have been engineering?
must you have been engineering?
must they have been engineering? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mustn't I engineer?
mustn't you engineer?
mustn't she engineer?
mustn't we engineer?
mustn't you engineer?
mustn't they engineer? 	mustn't I be engineering?
mustn't you be engineering?
mustn't she be engineering?
mustn't we be engineering?
mustn't you be engineering?
mustn't they be engineering? 	mustn't I have engineered?
mustn't you have engineered?
mustn't she have engineered?
mustn't we have engineered?
mustn't you have engineered?
mustn't they have engineered? 	mustn't I have been engineering?
mustn't you have been engineering?
mustn't she have been engineering?
mustn't we have been engineering?
mustn't you have been engineering?
mustn't they have been engineering?