If someone asks you in English "Do you speak English?" they simply want to know if you can understand a certain amount of English.
The English language is the language of Americans because one of the main groups of European settlers came from England. There were also large groups of French and Spanish who came, but people tend...
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People who are American speak American English and people who are British speak British English.
If you understand the language,you reply YES,if not,NO if you understand a little bit,you reply SOME.