《2025年与名师对话高中同步全程导学案高中英语选择性必修第一册外研版》

四、常使用非限制性定语从句的三种情况
1. 关系代词指代整个主句的内容时，用非限制性定语从句。
She said she had finished her work, which I doubted very much.
她说她已经完成了工作,我对此深感怀疑。
2. 先行词指世界上独一无二的事物、专有名词或表示类属事物时，用非限制性定语从句。
The moon, which is 384,400 kilometers away from the earth, creates many beautiful stories for people.
月球为人们创造了很多美好的故事，它距离地球 384400 千米远。
3. some/many/few/a few/little/much/most/two of which/whom 等结构中常用非限制性定语从句。
I have three foreign teachers, two of whom are from Canada.
我有三位外籍老师，其中两位来自加拿大。
[即学即练 5] 完成句子
①这对夫妇被邀请参加国宴，这对他们来说是莫大的荣幸。
The couple were invited to the state banquet,which was a great honour to themwhich was a great honour for them.
②年轻一代自愿到贫困地区教书，他们中大多数受过良好的教育。
The young generation,most of whom were well-educatedmost of whom are well-educated,volunteered to teach in poor areas.
③月球本身不发光，它只是地球的一个卫星。
The moon,which doesn't give out light itselfwhich does not give off light itself, is only a satellite of the earth.

答案： ①which was a great honour to them ②most of whom were well-educated ③which doesn't give out light itself

1 essential adj. 极其重要的；必不可少的 n. 要素，要点，实质；必需品
[教材原句] Which sentences contain a clause with essential information and which with extra information?(P6)
哪些句子包含一个带有极其重要信息的从句，哪些句子包含带有额外信息的从句？
(1)be essential to/for... 对……是要紧的
it is/was essential (for sb.) to do sth.(对某人来说)做某事是极其重要的
it is/was essential that... 句型中，从句中要用虚拟语气，谓语动词用“should+动词原形”，should 可省略
(2)essentially adv. 本质上；本来
[应用佳句]
①It’s essential for citizens to know that the haze can do harm to people’s health.(应用文写作之环境保护)
对市民来说，了解雾霾危害人们的健康是很有必要的。
②It is essential that you (should) come home early from the amusement park.
你必须早点从游乐园回家。
[助记填读] 单句语法填空
① The charity provides homeless people with essentialessentials(essential) like food and clothing.
②She added a few characters, and changed some names, butessentiallyessentially (essential)this is a true story.
[写作在线] 一句多译
你的饮食要多样化且均衡,这至关重要。
③Ais essential to/for youvaried and balanced dietis essential.
④ It is essential a varied and balanced diet.
⑤ What is essential is varied and balanced.

答案： ①essentials ②essentially
@@③is essential to/for you ④It is essential for you to have ⑤It is essential that your diet (should) be