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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to link more related multi-character Chinese words!

ēr, ér, ěr, èr

second tune

ér

son; child 兒 ér

son 兒子 ér zi
son 兒 ér	suffix 子 zi

daughter 女兒 nǚ ér
female 女 nǚ	son; child 兒 ér

Chinese characters also pronunced ér

third tune

ěr

ear 耳 ěr

ear 耳朵 ěr duō
ear 耳 ěr	quantifier for a flower 朵 duō

bait 餌 ěr

fish bait 魚餌 yú ěr
fish 魚 yú	bait 餌 ěr

Chinese characters also pronunced ě

fourth tune

èr

two, 2 二 èr

February 二月 èr yuè
two, 2 二 èr	month; moon 月 yuè