人教版初三英语第十三单元知识点汇总
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Unit 13 We're trying to save the earth!思维导图模板大纲
不定式和不定式短语作目的状语
主要用来修饰动词,表示某一动作或状态的目的。为了使目的意义更加清楚或表示强调意义时,还可以在前面加 in order to 或 so as to
He shouted and waved so as to be noticed.
在句子中作谓语动词的状语的不定式或不定式短语,表示的是主语的目的,因此,其逻辑主语通常是句子的主语
To draw maps properly, you need a special pen.
由 in order to 引导的目的状语,既可以置于句尾,也可以置于句首,而由 so as to 引导的目的状语,只能置于句尾,而不能置于句首。
They started early in order to get there in time.
In order to get there in time, they started early.
不定式的复合结构作目的状语
有自己的执行者时,要用不定式的复合结构(即在不定式或不定式短语之前加 for + 名词或宾格代词)作状语。
She fetched several bottles which she placed on the counter for Harry to inspect.
目的状语从句与不定式的转换
当目的状语从句中的主语与主句中的主语相同时,可以直接简化为不定式或不定式短语作状语
We'll start early in order that/so that we may arrive in time.
We'll start early in order to/so as to arrive in time.
当目的状语从句中的主语与主句中的主语不相同时,要用动词不定式的复合结构作状语。
I came early in order that you might read my report before the meeting.
I came early (in order) for you to read my report before the meeting.
意为“不仅……而且……”用于连接两个表示并列关系的成分,着重强调后者,其中的also有时可以省略
She not only plays well, but also writes music. 她不仅很会演奏,而且还会作曲
若连接两个成分作主语,其谓语通常与靠近的主语保持一致
Not only you but also he has to leave. 不只是你,他也得离开
若连接两个句子,not only后面的句子要用倒装
Not only did he speak more correctly, but he spoke more easily. 他不仅说得更正确,而且讲得更不费劲了
pay for 付费
add up 累加
make a difference 产生影响
be full of the rubbish 充满了垃圾
at the bottom of the river 在河床底部
play a part in cleaning it up 尽一份力把它清理干净
ride in cars 开车出行
turn off 关掉
take action 采取行动
cut down air pollution 减少空气污染
throw litter into the river 把垃圾扔入河中