Well British isn't exactly a language...
No. People from Great Britain are British- most speak English. There is no language called British.
french people speak french but they don't only have to speak french.
Although there was a sizeable immigration from Portugal to France (it is the largest foreign community in France), you will not hear people speak Portuguese. People in Paris speak French.
Some do.
1
Italian
French is the primary language used in Paris. However, many residents and businesses also speak English, especially in tourist areas.
No. Paris is the capital of France. The capital of the United Kingdom of Great Britain and Northern Ireland (UK) is London. British people live in the UK.
Some Parisiens speak a local slang called Parigot
Yes, French is the official language of France, and it is widely spoken in Paris. Many residents and visitors in Paris speak French, although you can also find people who speak other languages due to the city's diverse population and tourist attractions.
Lots of people will speak English to you in Paris with no problem. Paris is in France, so French is the local language and just like you would prefer to speak your language where you live instead of a foreign language, the French people would of course have a preference for speaking French, rather than English or any other language.
Both English people and Americans speak English, but with differences in vocabulary, pronunciation, and grammar. American English has evolved separately from British English and has its own unique characteristics.