Thailand: primary language is Thai — English gets you by in tourist areas, but is inconsistent elsewhere.
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The primary language in Thailand is Thai.
English gets you by in tourist areas, but is inconsistent elsewhere. Reasonably common in Bangkok and tourist resort areas, much more limited elsewhere.
Learning "hello," "please," "thank you," "excuse me," and "the check please" in the local language goes a long way anywhere, including Thailand — locals consistently appreciate the effort.
Yes — an offline translation app is genuinely useful in Thailand, especially outside major tourist areas.