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