Hi Aud, The old-fashioned style, in North America, certainly (and I believe in Europe and the UK itself), was to use the adjective of one of the four countries of the UK followed by “-man”. (Or -woman, on the rare chance you were talking in the old days about the ladies ;)). This ending would be pronounced “min”, to rhyme with “spin”. So, Englishman, Welshman, Scotsman, Irishman. For them taken together, collectively you could say “the British”/“British people”. At that level of formality I would call one individual “a British person”. Informally (jocularly) they are “the Brits” and one member of that collective nationality is “a Brit”.

As an aside to the grammar: English and British are not the same thing. England is the country on the bottom half of the island. Britain is the whole island which consists of England, Scotland and Wales. Bonus: The United Kingdom is Britain + Northern Ireland and The British Isles is all that + the Republic of Ireland as well.

British and English are both refer to nationalities. Therefore examples 3 and 6 are correct. Same goes for any nationality. He is French or He is Russian, not He is a French or He is the Russian. Brit is a slang term for a person from Britain. In a general context He is a Brit is correct. Examples 10 and 12 are correct.

Thanks for the references to these sites. They are great, I will use them when I have some grammer questions.

Yes, that's right. Sometimes we can use adjectives as nouns - "substantives", in old grammar speak - and then they can take articles. So we have a big, traditional breakfast - eggs, bacon, sausages, mushrooms, tomatoes. beans, toast - which is sometimes called "the full English". "I'll have a full English, thank you." *Right, mate; and tea with that?" You could say that it's short for "full English breakfast. " Or you might be offered a choice; which of these cars would you like to take?" "I'll take the green." Again, more formally, you might expect "the green one". ADDITION : I've spotted your comment to Robbie (a bit late) and you are quite right. Those are adjectives functioning as nouns. It happens a lot. https://learnersdictionary.com/qa/adjectives-used-as-nouns http://myenglishgrammar.com/lesson-3-adjectives/4-adjectives-function-as-nouns.html