Eugen Bleuler invented the term in 1911, in a German report. It quickly crossed over into English.
It is only used by people who use English as their first language.
united kingdom
E is the most common letter in the English language.
English
English since it is the first or second language for most people.
is English the language commonly used in Vietnam
Yes a large population of the world can communicate in English, though it is not their first language. English is very popular and is used all around the world.
Generally "second language" refers to a second language someone can speak, ie: My first language is English, my second language is Spanish. Also, it can be used to let people know that one particular language is NOT your first, or best known. ie: English as a second language. Meaning your most fluent language is German, or Spanish or French, but you are learning English. Might help to get a more thorough answer if you used a sentence as an example, let us know how "Second Language" is used.
Some of the most commonly used words in the English language include "the", "people", "about", and "like". Other words include "time", "because", and "first".
I do believe that "this" is a four letter word in the English language which is used as a preposition.
Natural languages such as English are not invented. There was no one person who created the language and no one person who first used it. Modern English developed over time from Middle English, which developed from French and Old English (or Anglo-Saxon). And French developed through various stages from Latin with some Germanic influences.
It depends on what language you are talking about. In English, the letter X is least used for first names.