Because you didn't say it was the poem, you can't give a specific answer. I'll tell you the method first.
Analysis:
A complete syllable is a syllable that is read in one breath without spelling. These syllables should be memorized as a whole.
There are 16 syllables recognized as a whole:
Refers to, refers to, refers to, day, word, word, thought, meaning, thing, language, leaf, month, sound, rhyme, yuan and English.