Original sentence: According to some, a person's first language, native language or mother tongue is the language that was learned first by the person.Children growing up in bilingual homes can according to this definition have more than one mother tongue.In terms of that view, the person is called a native speaker of the language, although one may also be a native speaker of more than one language if all of the languages are learned naturally without formal instruction, such as through cultural immersion before puberty.It is quite possible that the first language learned is no longer a speaker's dominant language.Sometimes the term first language is used for the language that the speaker speaks best (his second language then being the language he speaks less well than his first language, etc).Sometimes the term mother tongue or mother language is used for the language that a person learnt at home (usually from his parents).Sometimes the term native language is used to indicate a language that a person is as proficient in as a native inhabitant of that language's base country, or as proficient as the average person who speaks no other language but that language.Sometimes the terms first language, second language and third language are used to indicate various levels of skill in a language, so that it can be said that a person knows more than one language at first or second language level.The terms first, native, and mother can also be misleading, regardless of their definitions.The usage of these terms are far from standardised, however
Edited sentence: A person's first language, native language or mother tongue is the language that was learned first by the person.Correspondingly, the person is called a native speaker of the language, although one may also be a native speaker of more than one language if all of the languages are learned naturally without formal instruction, such as through cultural immersion before puberty.It is quite possible that the first language learned is no longer a speaker's dominant language, and therefore no longer the first language.The terms first, native, and mother can be misleading