The word 'through' has only one syllable (pronounced throo).
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through--1 syllable light--1 syllable from--1 syllable heaven--2 syllables If you're trying to write the first line of a haiku, you're doing well.
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1 + 2 = 3 syllables
1 for young and 1 for girl = 2 syllables
2.
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It is two syllables. Rou-tine.
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"That's" has 1 syllable. "That is" has 2 syllables.