Usages of wàng
她 出门 前 忘 了 给 手机 充电， 只好 又 回 房间 换 了 一 块 电池。tā chūmén qián wàng le gěi shǒujī chōngdiàn, zhǐhǎo yòu huí fángjiān huàn le yí kuài diànchí.
She forgot to charge her phone before going out, so she had no choice but to go back to the room and change the battery.
我 出门 前 忘 了 关 灯。wǒ chūmén qián wàng le guān dēng.
I forgot to turn off the light before going out.
她 忘了 带 钥匙， 只好 在 门口 等 室友 来 开门。tā wàngle dài yàoshi, zhǐhǎo zài ménkǒu děng shìyǒu lái kāimén.
She forgot to bring her keys, so she had no choice but to wait at the door for her roommate to open it.
我 永远 不会 忘。wǒ yǒngyuǎn búhuì wàng.
I will never forget.
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