All writing systems are phonetic. Metrical poetry, homophones, loan words, where rhyme is intended, puns, variations over time (languages tend to change in regular ways) all give clues.
Also, languages tend to employ certain selections of consonants and vowels. How far you get depends in part on the writing system – ancient Egyptian wrote only the consonants, which makes the vowels guesswork, but Sumerian had a fuller writing system.
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