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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dōng, dóng, dǒng, dòng

first tune

dōng

winter 冬 dōng

winter 冬天 dōng tiān
winter 冬 dōng	day 天 tiān

east 東 dōng

oriental; eastern 東方 dōng fāng
east 東 dōng	direction 方 fāng

east, west, south, north 東,西,南,北 dōng xī nán běi
east 東 dōng	west 西 xī	south 南 nán	north 北 běi

Chinese characters also pronunced dōng

third tune

dǒng

trustee; member of a company board 董 dǒng

chairman of the company board 董事長 dǒng shì zhǎng
trustee 董事 dǒng shì	chief 長 zhǎng

understand 懂 dǒng

I don't understand 我不懂 wǒ bù dǒng
I 我 wǒ	not 不 bù	understand 懂 dǒng

fourth tune

dòng

cave; hole 洞 dòng

small hole; pinhole 小洞 xiǎo dòng
small 小 xiǎo	hole 洞 dòng

cavern 山洞 shān dòng
mountain 山 shān	cave 洞 dòng

move; touch 動 dòng

do not move 別動 bié dòng
do not 別 bié	move; touch 動 dòng

affecting; moving; touching 感動 gǎn dòng
sense; feel 感 gǎn	move; touch 動 dòng

freeze; frozen 凍 dòng

refrigerate 冷凍 lěng dòng
cold 冷 lěng	freeze; frozen 凍 dòng

Chinese characters also pronunced dòng