English.
The most commonly spoken language in the UK is English.
The most commonly spoken language in Paris is French.
Spanish is the most commonly spoken language in Central America.
Welsh is the most commonly spoken Celtic language, about 90% of the speakers live in Wales and England. Irish is the second commonly spoken.
Russian is the most commonly spoken Language in Europe.
Portugeze is the most commonly spoken language in Brazil.
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Spanish is the second most common "spoken" language. The second most common language is sign language.
English.
Russian
English
Mandarin