7月8口语提高 口语

莲世界

我做完作业后才回家.(这句话的三种说法)
一.I did not return home before I finished my work.
二.I did not return home until I finish my work.
三.I returned home only after I finished my work.

youxiaxiaolala

I didn't understand the means until I saw this sentence.

当时的月亮

一.I did not return home before I finished my work.
二.I did not return home until I finish my work.

为什么第一句用finished,第二句用finish?