探究点1 until 的用法
until 介词,意为“到……时;直到……为止”,表示动作、状态的延续。
I will stay here until 5 p.m.
我会在这里待到下午5点。
[知识拓展]

情境应用
1. We don't know the love of our parents we become parents ourselves one day.
A. until B. after
C. when D. since
2. I finish my homework my mother came back yesterday.(直到……才)
3. I'll study 8:00 p.m.(直到)

1. A
2. didn't; until
3. until

1. 该句符合not...until...（直到……才）的固定结构，表达“直到我们自己某天成为父母，才懂得父母的爱”的含义，B（在……之后）、C（当……时）、D（自从）均不符合语境，因此选A。
2. 题目要求表达“直到……才”，时间状语yesterday说明时态为一般过去时，非延续性动词finish的否定结构用didn't，搭配until构成not...until...结构。
3. 句中study是延续性动词，此处表示动作一直持续到晚上8点为止，用until作介词即可。

探究点2 dead 的用法
dead 形容词，意为“不运行的；死的”。
Lei Feng has been dead for many years, but his
spirit is still encouraging us.
雷锋已经去世了很多年，但他的精神仍然激励着我们。
[知识拓展]
辨析 dead, death, dying 与 die

The doctor failed to save her dying grandfather, and he died two days ago. That is to say, he has been dead for two days and she cried out after knowing her grandfather's death.
医生没能救活她奄奄一息的爷爷，他两天前去世了。也就是说，他已经去世两天了，她知道她爷爷去世后哭了起来。
情境应用
1. In her days, the old woman relaxed a little. ( die )
2. Everyone wants to be a famous man, but no one wants to . ( die )
3. Only after a week did she know about her father's . ( die )
4. William Shakespeare has been for more than 400 years, but his works still have a great influence(影响) today. ( die )

1. dying 2. die 3. death 4. dead

本题考查die相关不同词性变形的用法辨析：
1. 空后是名词days，此处需要形容词作定语，表达“临终的”含义，dying是形容词，意为“临终的、垂死的”，符合语境。
2. 固定结构want to do sth. 后接动词原形，die是不及物动词，意为“死亡、断气”，强调死的瞬间动作，符合语境。
3. 名词所有格father's后需要接名词，death是名词，意为“死亡”，指代父亲去世这件事，符合语境。
4. 句中for more than 400 years是时间段，需要用可延续的状态表达，be动词后接形容词dead，意为“死的”，强调死亡的持续状态，可和时间段连用，符合语境。