Null-subject language

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In linguistic typology, a null-subject language is a language whose grammar permits an independent clause to lack an explicit subject; such a clause is then said to have a null subject. In the principles and parameters framework, the null subject is controlled by the pro-drop parameter, which is either on or off for a particular language. Typically, null-subject languages express person, number, and/or gender agreement with the referent on the verb, rendering a subject noun phrase redundant. For example, in Italian the subject "she" can be either explicit or implicit: The subject "(s)he" of the second sentence is only implied in Italian. English and French, on the other hand, require an explicit subject in this sentence. Null-subject languages include Arabic, most Romance languages, Chinese, Vietnamese, Greek, Hebrew, the Indo-Aryan languages, Japanese, Korean, Persian, the Slavic languages, Tamil, and the Turkic languages.