优质解答
火眼金睛：
1.“开”“ 关”自有度：
【辨析】turn on,turn off,turn up,turn down
turn on意为“（把水源、煤气、电源等）打开”,其反义词组为turn off；
turn down意为“（把收音机的音量、灯等）关小、调低”,其反义词组为turn up.这些短语中on,off,up,down均为副词,后接宾语是代词时,应位于它们的前面.例如：
Please turn off ／on the radio．请把收音机关上（打开）.
The radio is very loud．Can you turn it down a little,please?
收音机声音太大,你能开小一点吗?
She sat down and turned up the radio．她坐来下,把收音机开大.
You must turn off the light when you leave the classroom.(记住了!)
Turn up（找到）:Don't worry; something will turn up.
（不要着急,会有办法的.）
Turn down（被向下折转, 拒绝）：
Do you think I should turn down his offer? 你认为我应该拒绝他的报价吗?
2.深入“内部”细分辨：
into与in都有“在……内”的意思,它们都可做介词.但它们有些差别：
①in意为“在…内”,是表示静态的介词,指的是物体存在的状态.
②into意为“进…里”,是表示动态的复合介词,侧重指把物体从外部放到里面的动作.
试比较：
She is walking in the room.她正在房间里踱来踱去.
She walked into the room.她走进了房间.
③在put, throw, break, lay, fall等动态较强的动词之后,既可以用in,也可以用into,这时in也表示动态,常含有into的意思.例如：
He put all the books in/into the bag.他把所有的书都放进书包里.
④In可以作副词,into不可.例如：Come in! 进来!
3.风水轮流转：
take turns意思是“轮流,依次,turn在此处作名词,意思是“顺序”.由turn构成的短语还有：by turns(轮流,交替)；in turn(依次,逐一).
这三个短语的性质不同,用法上有所不同.看下面的句子,你会有感悟的!
1)There were twelve of us in the boat and we rowed by turns.
我们船上的十二人轮流划船.
She went hot and cold by turns. 她时冷时热.
2)We went in turn to be examined by the doctor. 我们逐一进来让医生检查.
Theory derives from practice and in turn serves practice.
理论来源于实践,又反过来指导实践.
3)The three brothers will take turns to look after their sick mother.
三兄弟将轮流来照顾他们生病的妈妈.
从例句中不难看出by turns为介词短语,作状语使用.意思是"轮流","一阵(时)…一阵(时)…;in turn也是一个介词短语,用作状语.意思是"一个接一个地",“又(对别人或物)做同样的事";而take turns是一个短语动词,在句子中多做谓语.意思是"轮流(做某事)".
4.不一般的“喜欢”：
（1 like 做动词时,无进行时态,意为“喜欢”,其用法如下：
like sb./sth. 喜欢某人/某物
like to do sth “（偶尔或具体一次）想做什么事情”
like doing sth则是“（经常或习惯性）喜欢做什么事情”
比如：
Today I would like to watch a movie.今天我想去看电影.
When I am free, I like seeing films.
我有空就喜欢去看电影.
题例：I like_______, but I don't like ________ right now.
A.singing, to sing B.to sing, singing
C.singing,singing D.to sing,to sing (答案选：A)
（2）like还可以做介词,意为“像……；与……一样”,且常与look或 be连用,look like“看起来像”用来指相貌,be like“像”常用来 指性格或相貌.
（3）like动词形式的反义词是dislike(不喜欢);like介词形式的反义词 是unlike(不像).
5.多种需求列清单：
“need”既可以作情态动词,也可以作实义动词或名词,但是它们的用法不同：
（一）need作情态动词的用法：
need用作情态动词时表“必须,必要”的意思,后直接跟动词原形,且need无人称、数的变化（第三人称单数不加s）,也没有非谓语形式（不定式、分词）.
注意：need用作情态动词时常用于否定句和疑问句中.例：
Need he bring his laptop tomorrow? 明天他必须带他的笔记本过来吗?
Come on, you needn't worry about it becuse it's not your fault.
行啦,你不必担心的,因为那不是你的错.
She needn't have arrived so early, need she?
她本不必到得这么早,不是吗?
注意：must引导的一般疑问句的否定回答必须使用needn't.例：
-- Must I leave? 我必须离开吗?
-- No, you needn't. 不,你不必离开.
（二）need作实意动词的用法：
①need + something 需要某物
例：I need some fruits to eat. 我需要些水果来吃.
②need to do something 需要做某事
例：You don't need to have the bike repaired right away.
你不必马上去修车.
③need doing = need to be done 需要……（表示被动）
例：The room needs cleaning = The room needs to be cleaned.
房间需要打扫了.
④need somebody to do something 需要某人做某事
例：I need someone to help me out of this problem.
我需要找人来帮助我解决这个问题.
（三）need作名词的用法：
need用作名词时,既可以是可数名词,也可以是不可数名词.
主要常用句型如下：
①(There's) no need to do something 没必要做某事
例：There's no need to cover such a long distance.
没必要走那么远的距离.
There's no need for me to break the window because I have the key. 我没必要打破窗户因为我有钥匙.
No need to run since we're not pressed for time.
不必跑啦,我们又不赶时间.
也可以单独使用：There's no need. 意思是“没有必要”.
②in (great) need of （非常）需要
例：The rescue team is in great need of medicine.
救援小组非常需要药品.
③if need be 如果需要的话
例：If need be, I'm going to do you a favor. 如果需要的话我会帮你的.
四、关于need的一句名言：
A friend in need is a friend indeed. 患难之交才是真朋友.
火眼金睛：
1.“开”“ 关”自有度：
【辨析】turn on,turn off,turn up,turn down
turn on意为“（把水源、煤气、电源等）打开”,其反义词组为turn off；
turn down意为“（把收音机的音量、灯等）关小、调低”,其反义词组为turn up.这些短语中on,off,up,down均为副词,后接宾语是代词时,应位于它们的前面.例如：
Please turn off ／on the radio．请把收音机关上（打开）.
The radio is very loud．Can you turn it down a little,please?
收音机声音太大,你能开小一点吗?
She sat down and turned up the radio．她坐来下,把收音机开大.
You must turn off the light when you leave the classroom.(记住了!)
Turn up（找到）:Don't worry; something will turn up.
（不要着急,会有办法的.）
Turn down（被向下折转, 拒绝）：
Do you think I should turn down his offer? 你认为我应该拒绝他的报价吗?
2.深入“内部”细分辨：
into与in都有“在……内”的意思,它们都可做介词.但它们有些差别：
①in意为“在…内”,是表示静态的介词,指的是物体存在的状态.
②into意为“进…里”,是表示动态的复合介词,侧重指把物体从外部放到里面的动作.
试比较：
She is walking in the room.她正在房间里踱来踱去.
She walked into the room.她走进了房间.
③在put, throw, break, lay, fall等动态较强的动词之后,既可以用in,也可以用into,这时in也表示动态,常含有into的意思.例如：
He put all the books in/into the bag.他把所有的书都放进书包里.
④In可以作副词,into不可.例如：Come in! 进来!
3.风水轮流转：
take turns意思是“轮流,依次,turn在此处作名词,意思是“顺序”.由turn构成的短语还有：by turns(轮流,交替)；in turn(依次,逐一).
这三个短语的性质不同,用法上有所不同.看下面的句子,你会有感悟的!
1)There were twelve of us in the boat and we rowed by turns.
我们船上的十二人轮流划船.
She went hot and cold by turns. 她时冷时热.
2)We went in turn to be examined by the doctor. 我们逐一进来让医生检查.
Theory derives from practice and in turn serves practice.
理论来源于实践,又反过来指导实践.
3)The three brothers will take turns to look after their sick mother.
三兄弟将轮流来照顾他们生病的妈妈.
从例句中不难看出by turns为介词短语,作状语使用.意思是"轮流","一阵(时)…一阵(时)…;in turn也是一个介词短语,用作状语.意思是"一个接一个地",“又(对别人或物)做同样的事";而take turns是一个短语动词,在句子中多做谓语.意思是"轮流(做某事)".
4.不一般的“喜欢”：
（1 like 做动词时,无进行时态,意为“喜欢”,其用法如下：
like sb./sth. 喜欢某人/某物
like to do sth “（偶尔或具体一次）想做什么事情”
like doing sth则是“（经常或习惯性）喜欢做什么事情”
比如：
Today I would like to watch a movie.今天我想去看电影.
When I am free, I like seeing films.
我有空就喜欢去看电影.
题例：I like_______, but I don't like ________ right now.
A.singing, to sing B.to sing, singing
C.singing,singing D.to sing,to sing (答案选：A)
（2）like还可以做介词,意为“像……；与……一样”,且常与look或 be连用,look like“看起来像”用来指相貌,be like“像”常用来 指性格或相貌.
（3）like动词形式的反义词是dislike(不喜欢);like介词形式的反义词 是unlike(不像).
5.多种需求列清单：
“need”既可以作情态动词,也可以作实义动词或名词,但是它们的用法不同：
（一）need作情态动词的用法：
need用作情态动词时表“必须,必要”的意思,后直接跟动词原形,且need无人称、数的变化（第三人称单数不加s）,也没有非谓语形式（不定式、分词）.
注意：need用作情态动词时常用于否定句和疑问句中.例：
Need he bring his laptop tomorrow? 明天他必须带他的笔记本过来吗?
Come on, you needn't worry about it becuse it's not your fault.
行啦,你不必担心的,因为那不是你的错.
She needn't have arrived so early, need she?
她本不必到得这么早,不是吗?
注意：must引导的一般疑问句的否定回答必须使用needn't.例：
-- Must I leave? 我必须离开吗?
-- No, you needn't. 不,你不必离开.
（二）need作实意动词的用法：
①need + something 需要某物
例：I need some fruits to eat. 我需要些水果来吃.
②need to do something 需要做某事
例：You don't need to have the bike repaired right away.
你不必马上去修车.
③need doing = need to be done 需要……（表示被动）
例：The room needs cleaning = The room needs to be cleaned.
房间需要打扫了.
④need somebody to do something 需要某人做某事
例：I need someone to help me out of this problem.
我需要找人来帮助我解决这个问题.
（三）need作名词的用法：
need用作名词时,既可以是可数名词,也可以是不可数名词.
主要常用句型如下：
①(There's) no need to do something 没必要做某事
例：There's no need to cover such a long distance.
没必要走那么远的距离.
There's no need for me to break the window because I have the key. 我没必要打破窗户因为我有钥匙.
No need to run since we're not pressed for time.
不必跑啦,我们又不赶时间.
也可以单独使用：There's no need. 意思是“没有必要”.
②in (great) need of （非常）需要
例：The rescue team is in great need of medicine.
救援小组非常需要药品.
③if need be 如果需要的话
例：If need be, I'm going to do you a favor. 如果需要的话我会帮你的.
四、关于need的一句名言：
A friend in need is a friend indeed. 患难之交才是真朋友.