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 clauses. Subject may be presented by following forms:

• Noun or pronoun (optionally with determiner);
• Infinitive (optionally with dependent words);
• Dependent sentence or clause;
• may be absent but implied (e.g. in imperative clauses like “Do your job!”)
• may be absent but included in predicate, as enclitic pronoun becoming a suffix of person (“Ukhat” = “he goes”)

It may be hard to distinguish subject from other parts of sentence in following cases:

• Sentence with ergative structure;