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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lēi, léi, lěi, lèi

first tune

lēi

strangle tie or strap something tight 勒 lēi

second tune

léi

thunder 雷 léi

rumble with thunder 打雷 dǎ léi
hit; strike 打 dǎ	thunder 雷 léi

Thor God of thunder 雷神 léi shén
thunder 雷 léi	god 神 shén

Chinese characters also pronunced léi

third tune

lěi

accumulate; pile up 累 lěi

accumulate; cumulative 累積 lěi jī
accumulate 累 lěi	accumulate 積 jī

Chinese characters also pronunced lěi

fourth tune

lèi

tired; weary; fatigue 累 lèi

I am so tired. 我好累 wǒ hǎo lèi
I 我 wǒ	so; very 好 hǎo	tired 累 lèi

tears 淚 lèi

weep; shed tears 流淚 liú lèi
flow 流 liú	tears 淚 lèi

kind; type alike; similar 類 lèi

mankind human kind; human race 人類 rén lèi
human 人 rén	kind; type 類 lèi

similar; resembling 類似 lèi sì
alike; similar 類 lèi	similar; alike 似 sì

Chinese characters also pronunced lèi