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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hēi, héi, hěi, hèi

first tune

hēi

black; dark 黑 hēi

black and white 黑,白 hēi bái
black 黑 hēi	white 白 bái

dark; darkness 黑暗 hēi àn
dark 黑 hēi	dim; dark 暗 àn

Chinese characters also pronunced hēi