(pos:代詞)
<explanation>
yue:後面緊接住某個結果，跟住再用「#係」帶出呢個結果嘅原因
eng:the reason why, followed by a consequence, and then the verb #係 hai6 and the reason
<eg>
yue:佢之所以唔鍾意你，係因為你食煙。 (keoi5 zi1 so2 ji5 m4 zung1 ji3 nei5, hai6 jan1 wai6 nei5 sik6 jin1.)
eng:She doesn't like you because you smoke.
<eg>
yue:我之所以唔嚟，係因為佢喺度。 (ngo5 zi1 so2 ji5 m4 lai4, hai6 jan1 wai6 keoi5 hai2 dou6.)
eng:The reason that I didn't come was because he was there.