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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māi, mái, mǎi, mài

second tune

mái

bury 埋 mái

bury; entomb 埋葬 mái zàng
bury 埋 mái	inter 葬 zàng

Chinese characters also pronunced mái

third tune

mǎi

buy; purchase 買 mǎi

grocery shopping 買菜 mǎi cài
buy 買 mǎi	vegetables 菜 cài

buy and sell 買,賣 mǎi mài
buy 買 mǎi	sell 賣 mài

fourth tune

mài

sell; sale 賣 mài

auction sale by acution 拍賣 pāi mài
auction 拍 pāi	sell; sale 賣 mài

buy and sell 買,賣 mǎi mài
buy 買 mǎi	sell 賣 mài

wheat 麥 mài

wheatland; wheat field land used for growing wheat 麥田 mài tián
wheat 麥 mài	field; farmland 田 tián

Chinese characters also pronunced mài