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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lāi, lái, lǎi, lài

second tune

lái

come; coming 來 lái

come and go 來,去 lái qù
come 來 lái	go 去 qù

future 未來 wèi lái
not yet 未 wèi	coming 來 lái

Chinese characters also pronunced lái

fourth tune

lài

depend on; rely on deny one's error shirk one's responsibility 賴 lài

rely on; depend on 依賴 yī lài
depend on 依 yī	rely on 賴 lài

repudiate a debt refuse to pay a debt go back on one's word 賴帳 lài zhàng
shirk one's responsibility 賴 lài	debts 帳 zhàng

Chinese characters also pronunced lài