Most people speak English as a first language in the USA.

在美国，大多数人把英语作为第一语言（主动语态）。

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Chinese is spoken as a first language by most people in China.

在中国大多数人把汉语作为第一语言。

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There are more countries preparing to English as a first language in foreign language teaching.

还有更多的国家准备将英语列为外语教学中的第一外语。

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Cornish is believed to have died out as a first language in the late 18th Century.

BBC: Land's End Cornish translation removal criticised

Cornish is believed to have died out as a first language in 1777.

BBC: Cornish language no longer extinct, says UN

Not really, just evidence of the familiar problem of British skills shortages a problem so acute that many employers prefer to hire a worker who does not have English as a first language, in preference to a less-skilled native.

ECONOMIST: Employment