must deduce
Regular verb: deduce - deduced- deduced

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must deduce
you must deduce
she must deduce
we must deduce
you must deduce
they must deduce 	I must be deducing
you must be deducing
she must be deducing
we must be deducing
you must be deducing
they must be deducing	I must have deduced
you must have deduced
she must have deduced
we must have deduced
you must have deduced
they must have deduced	I must have been deducing
you must have been deducing
she must have been deducing
we must have been deducing
you must have been deducing
they must have been deducing	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mustn't deduce
you mustn't deduce
she mustn't deduce
we mustn't deduce
you mustn't deduce
they mustn't deduce 	I mustn't be deducing
you mustn't be deducing
she mustn't be deducing
we mustn't be deducing
you mustn't be deducing
they mustn't be deducing	I mustn't have deduced
you mustn't have deduced
she mustn't have deduced
we mustn't have deduced
you mustn't have deduced
they mustn't have deduced	I mustn't have been deducing
you mustn't have been deducing
she mustn't have been deducing
we mustn't have been deducing
you mustn't have been deducing
they mustn't have been deducing	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I deduce?
must you deduce?
must she deduce?
must we deduce?
must you deduce?
must they deduce? 	must I be deducing?
must you be deducing?
must she be deducing?
must we be deducing?
must you be deducing?
must they be deducing? 	must I have deduced?
must you have deduced?
must she have deduced?
must we have deduced?
must you have deduced?
must they have deduced? 	must I have been deducing?
must you have been deducing?
must she have been deducing?
must we have been deducing?
must you have been deducing?
must they have been deducing? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mustn't I deduce?
mustn't you deduce?
mustn't she deduce?
mustn't we deduce?
mustn't you deduce?
mustn't they deduce? 	mustn't I be deducing?
mustn't you be deducing?
mustn't she be deducing?
mustn't we be deducing?
mustn't you be deducing?
mustn't they be deducing? 	mustn't I have deduced?
mustn't you have deduced?
mustn't she have deduced?
mustn't we have deduced?
mustn't you have deduced?
mustn't they have deduced? 	mustn't I have been deducing?
mustn't you have been deducing?
mustn't she have been deducing?
mustn't we have been deducing?
mustn't you have been deducing?
mustn't they have been deducing?