English is my native language.

English is not my native language.

Mr Wright speaks Japanese as if it were his mother tongue.

Japanese is our mother tongue.

What is your mother tongue?

She can't even speak her native language without making mistakes.

She can't even speak her native language without making mistakes.

The foreigner speaks Japanese as if it were his native language.

Italian is my native language.

She speaks five foreign languages, but when she wants to curse she speaks in her mother tongue.

His native language is French.

One way to lower the number of errors in the Tatoeba Corpus would be to encourage people to only translate into their native languages.

I am a native Japanese-speaking woman. But even though this is the case, I sometimes still make small mistakes when I am writing or speaking.

Is it possible to forget your native language?

Asking a non-native French speaker to translate a document into French is like asking an accountant to build you a house.

Asking a non-native French speaker to translate a document into French is like asking an accountant to build you a house.

Hiring a non-native French speaker to translate the document into French is like hiring a carpenter to fix your leaky faucet.