资源简介

(共18张PPT)
Unit 6 Section B
语句精讲
人教版九年级上册
语句总览
语句总览
since意为“自从……以来”，后接过去的时间点(如具体年份、事件、从句等)，是现在完成时的典型标志。
since后接过去的时间起点(时间点/事件/从句)，主句必须用现在完成时(have/has + 过去分词)。
【解析】
【知识点1】since + 时间点
句 1
Since the beginning of our history, people have looked up at the moon and wondered what it was like. 从人类历史开始，人们就仰望月亮，想知道它是什么样子。
【例句】
She has studied English since she was ten years old.
她从十岁起就开始学英语。
They have known each other since last summer.
他们从去年夏天就认识了。
My brother has played basketball since he joined
the school team.
我哥哥自从加入校队就开始打篮球。
“beginning” 是名词，表示“开始”，不是动词。
常用于描述时间、事件、故事、项目、关系等的起点。
【解析】
【知识点2】the beginning of ……的开始
【例句】
The beginning of the school year is always busy.
新学年开始的时候总是很忙。
At the beginning of the movie, there was a beautiful scene in the forest.
电影开头有一个美丽的森林场景。
as 在这里是从属连词，意思是“随着……”。强调“今昔对比”，暗示现在已经改变。
作用：用来表示主句动作发生的时间背景。
【解析】
【知识点】as 引导时间状语从句
However, as research methods developed, scientists learnt the truth about planets. 然而，随着研究方法的发展，科学家们了解了行星的真相。
句 2
【例句】
As smartphone technology advanced, people’s lives became more convenient.
随着智能手机技术进步，人们的生活变得更便利了。
As environmental protection awareness developed, more people started to use reusable bags.
随着环保意识增强，更多人开始使用可重复使用的袋子。
As I grew taller, I could reach the books on the top shelf.
随着我长高，我能够到书架顶层的书了。
定冠词 the 表示特指某一个或某些具体的挑战。
后面of + 名词/动名词/名词性从句，用于说明“什么方面的挑战”。
【解析】
【知识点1】the challenge of ... ……的挑战
The challenge of visiting Mars gets even greater for space flights with humans.
对于载人太空飞行来说，访问火星的挑战变得更加艰巨。
句 3
【例句】
The challenge of the task made him nervous.
这项任务的挑战让他感到紧张。
The challenge of playing basketball well is improving your shooting skills.
打好篮球的挑战是提升投篮技巧。
We face the challenge of how to save water.
我们面临着如何节约水资源的挑战。
get：在这里作为系动词使用，意为“变得”，功能类似 become。
even：程度副词，修饰后面的形容词比较级，表示程度上的加深，意为“甚至更加……”、“越发……”。
【解析】
【知识点2】get even + 形容词比较级
【例句】
It’s cold outside, but it gets even colder at night.
外面已经冷了，到了晚上甚至变得更冷了。
The road gets even steeper here.
这里的路变得更陡了。
It：形式主语，没有实际意思，真正的主语为that后面的从句。
seems：系动词，意为“似乎、看起来”。
seem后面只能填形容词(如 clear, likely)，不能填副词。
【解析】
【知识点】It seems + adj. + that... 似乎…… / 看起来……
句 4
It seems possible that one day people may reach the stars. 似乎有一天人们可以到达星星。
【例句】
It seems unlikely that he passed the exam without studying.
他没学习就通过了考试，这似乎不太可能。
It seems strange that he didn’t show up.
很奇怪他竟然没出现。
It seems clear that she is the best candidate.
很明显她是最佳候选人。
My uncle has worked in this hospital _______ 2010.
A. for
B. since
C. in
D. at
模拟考场
The environment is getting worse _______ the population grows.
A. but
B. for
C. so
D. as
模拟考场
用所给词的适当形式填空。
模拟考场
1. The situation got even ______ (good) than we expected.
2. It seems ___________ (need) that we take immediate action.
better
necessary
改错（找出错误并改正）。
模拟考场
1. He faced the challenge of live alone.
错误：______ → 改正：________
2. The weather will get even bad tomorrow.
错误：______ → 改正：________
live
bad
living
worse
完成句子（根据中文提示补全英文）。
模拟考场
1. 自从上周二以来，天气一直很冷。
The weather has been cold _________________.
2. 在电影的开头，主角是个普通的学生。
At _________________ the movie, the main character is an ordinary student.
since last Tuesday
the beginning of

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