Time-Relation Link
Before, after, during, or while what?
含义
A relation that orders two events relative to each other in time.
如何识别
Ask which event happens before, after, while, until, or since another.
示例
before|after|while|until|since
before dinner|after I arrived|while waiting
Call me before you leave.
Visual guide
time-relation frame [event A] timed by [event B] Call me before you leave call < leave (< means earlier)
A = main event, B = anchor before B: A < B after B: B < A while B: A overlaps B until B: A lasts to B since B: A starts at B
语言视角
用母语深入讲解
Time-relation clauses use expressions such as 的时候, 以前, 以后, 之后, 之前 and often place the time frame before the main event.
我到家的时候，天已经黑了。
wǒ dào jiā de shíhou, tiān yǐjīng hēi le = when I arrived home, sky already dark LE
在所学语言中
英语用 before、after、while、when、until、since、once 等把两个事件按先后、同时或持续关系连接起来。
Call me before you leave.
before you leave 表示时间关系：先“Call me”（给我打电话），后“you leave”（你离开）。
学习者可能选错 before、after、while、when、until、since 等连接词，或在时间从句中按中文直译时态，例如误用 will。
Same block, different coding
Both languages use this block strongly, but they signal it differently. Focus on form changes, not only meaning.