Null Subject Constructions

Null subject constructions are linguistic constructions found in languages that are typologically classified as null subject languages. null subject languages contain the pro-drop parameter, which is a language specific parameter, that is described as 'on' or 'off'. This parameter is also common in languages that contain a very rich system of verbal inflectional morphology, which enables the language to convey the number, person and even the gender of the pronoun or agent of the inflected verb. This parameter is found in multiple languages throughout the world, therefore null subject constructions are found in languages that are otherwise not related according to genetic classification.

Example of a Null Subject Constructions

Persian

من( ایرانی هستم)
(man) Irâni hast.am
(I) Iranian am
"I am Iranian"

Elements in parentheses, are not usually spoken in colloquial Persian, however, including the pronoun does not make the utterance any more or less grammatically correct.