Usages of yóujiàn
刚才 老师 给 我 发 了 邮件， 你 看 了 吗？Gāngcái lǎoshī gěi wǒ fā le yóujiàn, nǐ kàn le ma?
Just now the teacher sent me an email; did you see it?
她 一共 发 了 三 封 邮件 给 我。Tā yígòng fā le sān fēng yóujiàn gěi wǒ.
She sent me three emails in total.
今天 我 不但 开会， 而且 要 马上 给 她 回 邮件， 我们 晚上 再 聊天。Jīntiān wǒ bùdàn kāihuì, érqiě yào mǎshàng gěi tā huí yóujiàn, wǒmen wǎnshang zài liáotiān.
Today I not only have a meeting, but also need to reply to her email right away; let’s chat again tonight.
我 刚才 给 她 回 了 一 封 邮件。wǒ gāngcái gěi tā huí le yì fēng yóujiàn.
I just replied to her email.
Elon.io is an online learning platform
We have an entire course teaching Chinese grammar and vocabulary.