until 的英文解释是up to a specified time (直到某一时刻)或up to the time of a specified event (直到发生某事).
1. 用于肯定句中：
表示句子的动作一直持续到until短语所表示的时间为止,即表示动作的终点.一般可译为“直到……时(为止)”或“在……以前”.在这种用法中,句子的谓语动词必须是持续动词(非瞬间动词),如live, wait , last, love, like, stay, work, continue 等.所以不能单独说until 之前之后是什么时态,这取决于你要说话的背景
eg:1. He will be working until 5 o'clock. 他将一直工作到五点钟.
2. She was a bank clerk until the war, when she trained as a nurse. 她战前是个银行职员,战时受训当了护士.
2. until用于否定句中,表示句子的动作直到until短语所表示的时间才开始发生,即表示动作的起点.一般译为“直到……才”或“直到……之前
eg: The secret was never told until after the old man's death. 这个秘密在老人去世后才说出来.
2. Don't open it until your birthday. 等到你过生日那天再打开.
3.She didn't sleep until eight. 她八点钟才睡觉.
希望对你有帮助哦~