Usages of dài
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.
Elon.io is an online learning platform
We have an entire course teaching Chinese grammar and vocabulary.