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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dāng, dáng, dǎng, dàng

first tune

dāng

when 當 dāng

then; at that time 當時 dāng shí
when 當 dāng	time 時 shí

certainly of course 當然 dāng rán
when 當 dāng	just so 然 rán

Chinese characters also pronunced dāng

third tune

dǎng

block; ward off 擋 dǎng

obstruct; to block 阻擋 zǔ dǎng
obstruct 阻 zǔ	block; ward off 擋 dǎng

political party 黨 dǎng

Chinese characters also pronunced dǎng

fourth tune

dàng

pawn 當 dàng

pawn shop 當舖 dàng pù
pawn 當 dàng	shop 舖 pù

swing; sway 盪 dàng

swing on a swing 盪鞦韆 dàng qiū-qiān
swing; sway 盪 dàng	swing (toy) 鞦韆 qiū-qiān

upheaval; turbulent 動盪 dòng dàng
stir emotionally 動 dòng	swing; sway 盪 dàng

roam; sweep off 蕩 dàng

loiter; fool around 遊蕩 yóu dàng
roam; saunter 遊 yóu	roam 蕩 dàng

mop up; wipe up 掃蕩 sǎo dàng
wipe out; exterminate 掃 sǎo	roam; sweep off 蕩 dàng

Chinese characters also pronunced dàng