我现在要走了,再见!
wǒ xiànzài yào zǒule , zàijiàn !
I have to go now, goodbye!
课结束了,老师说再见。
kè jiéshù le , lǎoshī shuō zàijiàn 。
The class is over, the teacher said goodbye.
朋友要走了,我们互相说再见。
péngyǒu yào zǒule , wǒmen hùxiāng shuō zàijiàn 。
My friend is leaving, we said goodbye to each other.