Usages of huílái
我们 回来 了，我们 都 很 高兴。wǒmen huílái le,wǒmen dōu hěn gāoxìng.
We came back, and we are all very happy.
你 回来 了 吗？nǐ huílái le ma?
Have you come back?
Elon.io is an online learning platform
We have an entire course teaching Chinese grammar and vocabulary.