Hi @tomoko-adhami. I don’t think that any book could help you speak better English, or any language. My advice would be to speak, speak again and then some more, with real people!
Are you learning Welsh as well?
And may I ask if you are Japanese?
Welcome to the forum.
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Thanks for your advice. I am trying to improve my English via conversations with English or American people. On the other hand, I can’t speak Welsh but want to learn Welsh and Korean language too.