English verb conjugation
MUST DISTINGUISH

Regular verb: distinguish - distinguished - distinguished

Affirmation

Simple form	V-ing form
I must distinguish you must distinguish she must distinguish we must distinguish you must distinguish they must distinguish	I must be distinguishing you must be distinguishing she must be distinguishing we must be distinguishing you must be distinguishing they must be distinguishing
Perfect	V-ing perfect
I must have distinguished you must have distinguished she must have distinguished we must have distinguished you must have distinguished they must have distinguished	I must have been distinguishing you must have been distinguishing she must have been distinguishing we must have been distinguishing you must have been distinguishing they must have been distinguishing

Negation

Simple form	V-ing form
I mustn't distinguish you mustn't distinguish she mustn't distinguish we mustn't distinguish you mustn't distinguish they mustn't distinguish	I mustn't be distinguishing you mustn't be distinguishing she mustn't be distinguishing we mustn't be distinguishing you mustn't be distinguishing they mustn't be distinguishing
Perfect	V-ing perfect
I mustn't have distinguished you mustn't have distinguished she mustn't have distinguished we mustn't have distinguished you mustn't have distinguished they mustn't have distinguished	I mustn't have been distinguishing you mustn't have been distinguishing she mustn't have been distinguishing we mustn't have been distinguishing you mustn't have been distinguishing they mustn't have been distinguishing

Interrogative form

Simple form	V-ing form
must I distinguish? must you distinguish? must she distinguish? must we distinguish? must you distinguish? must they distinguish?	must I be distinguishing? must you be distinguishing? must she be distinguishing? must we be distinguishing? must you be distinguishing? must they be distinguishing?
Perfect	V-ing perfect
must I have distinguished? must you have distinguished? must she have distinguished? must we have distinguished? must you have distinguished? must they have distinguished?	must I have been distinguishing? must you have been distinguishing? must she have been distinguishing? must we have been distinguishing? must you have been distinguishing? must they have been distinguishing?

Interro-negative form

Simple form	V-ing form
mustn't I distinguish? mustn't you distinguish? mustn't she distinguish? mustn't we distinguish? mustn't you distinguish? mustn't they distinguish?	mustn't I be distinguishing? mustn't you be distinguishing? mustn't she be distinguishing? mustn't we be distinguishing? mustn't you be distinguishing? mustn't they be distinguishing?
Perfect	V-ing perfect
mustn't I have distinguished? mustn't you have distinguished? mustn't she have distinguished? mustn't we have distinguished? mustn't you have distinguished? mustn't they have distinguished?	mustn't I have been distinguishing? mustn't you have been distinguishing? mustn't she have been distinguishing? mustn't we have been distinguishing? mustn't you have been distinguishing? mustn't they have been distinguishing?