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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biān, bián, biǎn, biàn

first tune

biān

knit; weave 編 biān

editing; compilation 編輯 biān jí
edit 編 biān	collect 輯 jí

side; edge 邊 biān

left-hand side 左邊 zuǒ biān
left (side) 左 zuǒ	side; edge 邊 biān

right-hand side 右邊 yòu biān
right (side) 右 yòu	side; edge 邊 biān

Chinese characters also pronunced biān

third tune

biǎn

flat 扁 biǎn

flat 扁平 biǎn píng
flat 扁 biǎn	level 平 píng

Chinese characters also pronunced biǎn

fourth tune

biàn

handy; convenient 便 biàn

convenient; convenience 方便 fāng biàn
method; way 方 fāng	handy; convenient 便 biàn

change; transform 變 biàn

alter; change 改變 gǎi biàn
change; correct 改 gǎi	change 變 biàn

tell apart 辨 biàn

differentiate; tell apart 辨別 biàn bié
tell apart 辨 biàn	difference 別 bié

argue; debate 辯 biàn

debate 辯論 biàn lùn
argue; debate 辯 biàn	discuss 論 lùn

Chinese characters also pronunced biàn