The second language native to Iceland is Icelandic Sign Language. The second most widely spoken language in Iceland is English (as a foreign language).
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There are no "demerits of second language."
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Any language you learn after your first (native) language is
considered a second language. There is no specific one.
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== English is spoken as a second language by around 600 million
people and French, with around 500 million as a second language.
Spanish is also very popular as a second language with 100 million
choosing this as a second language.