I must distinguish you must distinguish she must distinguish we must distinguish you must distinguish they must distinguish
V-ing form
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
I must have distinguished you must have distinguished she must have distinguished we must have distinguished you must have distinguished they must have distinguished
V-ing perfect
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
I must not distinguish you must not distinguish she must not distinguish we must not distinguish you must not distinguish they must not distinguish
V-ing form
I must not be distinguishing you must not be distinguishing she must not be distinguishing we must not be distinguishing you must not be distinguishing they must not be distinguishing
Perfect
I must not have distinguished you must not have distinguished she must not have distinguished we must not have distinguished you must not have distinguished they must not have distinguished
V-ing perfect
I must not have been distinguishing you must not have been distinguishing she must not have been distinguishing we must not have been distinguishing you must not have been distinguishing they must not have been distinguishing
Interrogative form
Simple form
must I distinguish? must you distinguish? must she distinguish? must we distinguish? must you distinguish? must they distinguish?
V-ing form
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
must I have distinguished? must you have distinguished? must she have distinguished? must we have distinguished? must you have distinguished? must they have distinguished?
V-ing perfect
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
must I not distinguish? must you not distinguish? must she not distinguish? must we not distinguish? must you not distinguish? must they not distinguish?
V-ing form
must I not be distinguishing? must you not be distinguishing? must she not be distinguishing? must we not be distinguishing? must you not be distinguishing? must they not be distinguishing?
Perfect
must I not have distinguished? must you not have distinguished? must she not have distinguished? must we not have distinguished? must you not have distinguished? must they not have distinguished?
V-ing perfect
must I not have been distinguishing? must you not have been distinguishing? must she not have been distinguishing? must we not have been distinguishing? must you not have been distinguishing? must they not have been distinguishing?