Usages of wàngjì
他 忘记 带 手机 了， 所以 我 发 消息 给 他 也 看 不 到。Tā wàngjì dài shǒujī le, suǒyǐ wǒ fā xiāoxi gěi tā yě kàn bù dào.
He forgot to bring his phone, so even if I send him a message he can’t see it.
我 刚才 忘记 带 书 了， 他 帮 我 开 门。Wǒ gāngcái wàngjì dài shū le, tā bāng wǒ kāi mén.
I just forgot to bring the book; he helped me open the door.
她 今天 又 忘记 带 手机， 又 迟到 了。Tā jīntiān yòu wàngjì dài shǒujī, yòu chídào le.
Today she both forgot her phone and was late.
我 和 她 一边 聊天， 一边 复习， 连 时间 都 忘记 了。Wǒ hé tā yìbiān liáotiān, yìbiān fùxí, lián shíjiān dōu wàngjì le.
She and I were chatting while reviewing and even forgot the time.
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