I agree that English is the most important language. Though Mandarin Chinese and Hindi are spoken by more people than english, the fact remains that English is the world language for business, politics and personal use. You can't judge a language's importance just by looking at the number of people speaking the language.

I agree with hypedave in that the second language greatly depends on the region you're living in. I would say the possible second languages include e.g. Chinese, Hindi, Arabic, Spanish, Russian, French and German.

I speak Finnish, English, Swedish, some German and a little Spanish.

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