I'd like to have a Japanese interpreter.我想请一位日本人翻译

今天的几个句子是有关语言不通的：1.I can't speak English.我不会说英语。2.My English isn't good enough. 我的英语不太好。3.A Japanese-speaking person, please. 请安排一位会说日语的人。4.Would you slow down, please?您能慢一点儿说吗？