The following video demonstrates each syllable of the pinyin structure
and the exercise of pinyin/zhuyin with basic Chinese 4-tune pronunciation

Mandarin pinyin tunes
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sēn, sén, sěn, sèn

first tune

sēn

luxuriant vegetation dark and obscure 森 sēn

forest 森林 sēn lín
luxuriant vegetation 森 sēn	woods 林 lín

gloomy; ominous threateningly inauspicious (Chinese idiom) 陰森森 sēn lín
overcast 陰 yīn	fearful; dark 森森 sēn sēn