Chinese · Pronunciation Guide
swor-YEE — but both syllables dip in citation form, so the first converts and you actually say suó yǐ.
suǒyǐ
A textbook conversion: two dipping tones in contact, so the first becomes a rising second tone. What makes 所以 especially demanding is that it usually precedes a subject pronoun, and if that pronoun also dips you end up with three dipping tones in a row — which Mandarin resolves by raising all but the last.
Listen: 所以
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下雨了,所以我在家。
Xià yǔ le, suǒyǐ wǒ zài jiā.
It's raining, so I'm staying home.
Listen: 下雨了,所以我在家。
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下雨了,所以我在家。 does exactly that. After the comma, suǒ, yǐ and wǒ are three consecutive dipping tones, so the first two both rise: suó yí wǒ. Only the pronoun keeps its dip. Three third-tone hooks on the page and one third tone in the mouth — this sentence is one of the clearest illustrations of the rule you will find.
Producing three laboured dips is the standard failure, and it makes the clause sound like it is being read out syllable by syllable. Learn suó yí wǒ as a fixed rhythmic unit. The other error is the s, which learners sometimes retroflex by analogy with sh — keep the tongue tip at the teeth and the hiss thin.