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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kēng, kéng, kěng, kèng

first tune

kēng

tunnel pit; hole in the ground entrap; defraud; swindle 坑 kēng

tunnel 坑道 kēng dào
tunnel 坑 kēng	way; path 道 dào

dig a hole 挖坑 wā kēng
dig 挖 wā	pit; hole 坑 kēng

entrap, ensnare or harm somebody 坑人 kēng rén
entrap; defraud 坑 kēng	people 人 rén

Chinese characters also pronunced kēng