Normally Thai language don't need "?" because Thai language have some words that use for ask question. Except informal case when the question is not the full sentence, you can use "?" to make the sentence complete.
April 3, 2019
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the tone can show if it's a question
April 7, 2019
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Thank you!! I get it now.
April 5, 2019
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Lizzy Hanks
Language Skills
Chinese (Mandarin), English, German, Spanish, Thai