Japan.
when they are in England
No. Although English is the most widely studied language in Japan, less than 1% of the population claims fluency.
In the USA most people speak a language somewhat like English.
Roughly 1.2 billion people speak Chinese as their first language, making it the most spoken language in the world.
They speak Greek.
There is no such language as Brazilian. The language most people in Brazil speak is Portuguese. Portugal is a European country.
Actually most people in Europe, not just Switzerland, speak more than one language, in fact most countries in the world are that way. America is the weird one in that most Americans speak only one language.
Most Cheyenne people today speak English if not as their first language certainly as a second language. Officially they speak their own language belonging to the algonquain language speaking people.
More people speak Mandarin than any other language. More places speak English than any other language.
More people on Earth speak Mandarin than any other language.
Japanese people do not speak Chinese unless they have learned it in school or have lived in China. For the languages of Japan, click here.