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Subject is one of two main parts of sentence together with predicate. It usually express the person or thing which makes or is modified by the action (predicate). However subject may be omitted, typically in impersonal and imperative clauses. Subject may be presented by following forms:
It may be hard to distinguish subject from other parts of sentence when subject is an enclitic pronoun becoming a prefix of person (“Tathrokh” = “He eats”).
Add more info about passive