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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ān, án, ǎn, àn

first tune

ān

peaceful 安 ān

safety 安全 bā yuè
peaceful 安 ān	whole 全 quán

saddle 鞍 ān

horse saddle 馬鞍 mǎ ān
horse 馬 mǎ	saddle 鞍 ān

Chinese characters also pronunced ān

third tune

ǎn

personal pronoun, I 俺 ǎn

fourth tune

àn

dark 暗 àn

dark, darkness 黑暗 hēi àn
black 黑 hēi	dark 暗 àn

light and shade brightness and darkness 明,暗 míng àn
brightness 明 míng	darkness 暗 àn

coast, shore 岸 àn

sea shore 海岸 hǎi àn
sea 海 hǎi	coast, shore 岸 àn

push down 按 àn

button 按鈕 àn niǔ
push down 按 àn	button 鈕 niǔ

case 案 àn

law case 案件 àn jiàn
case 案 àn	document 件 jiàn

Chinese characters also pronunced àn