The property of a language in which a sentence does not require an overt subject. Spanish is a pro-drop language: it is perfectly normal in Spanish to say No canto bien (Don't sing well) rather than Yo no canto bien (I don't sing well). English is not a pro-drop language and "Don't sing well" is not a grammatical sentence.
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"pro-drop." Grammar.com. STANDS4 LLC, 2021. Web. 26 Jan. 2021. <https://www.grammar.com/pro-drop>.