too和enough的区别和用法

Enough的否定形式1. 引言在英语中，否定形式是构成语法的重要部分。

它可以改变一个陈述句的意义，表达相反的观点。

本文将深入探讨单词”enough”的否定形式，包括其构成、用法和相关例句。

2. “Enough”的定义和正面用法首先，让我们了解一下”enough”这个词本身。

根据牛津词典的定义，“enough”是一个副词，表示数量、程度或质量达到或超过所需或期望的水平。

在正面用法中，“enough”通常用于以下几种情况：•表示足够的数量：There is enough food for everyone.•表示足够的程度：I am tired enough to go to bed early.•表示足够满意或合适：This dress is good enough for the party.3. “Enough”的否定形式要构成”enough”的否定形式，我们需要在其前面加上前缀“not”。

因此，“not enough” 是“enough”的否定形式。

当使用“not enough”时，它表达了不足、不够或不满意等意思。

以下是一些例句来说明它在句子中的应用：•There is not enough food for everyone at the party.•I am not tired enough to go to bed early.•This dress is not good enough for the party.需要注意的是，在否定形式中，“enough”之后的名词或形容词前不需要再加上冠词。

4. “Enough”的否定形式的用法4.1 表示不足够的数量当我们想要表达某物或某事的数量不足时，可以使用“not enough”。

以下是一些例句：•There are not enough chairs for all the guests.•She does not have enough money to buy a new car.•We did not bring enough water for the hike.4.2 表示不足够的程度当我们想要表达某事物或某人没有达到期望或要求的程度时，可以使用“not enough”。

too...to... 与enough...to... 与so...that...的区别too+adj./adv. to+v.太...而不能做某事例：He is too young to go to school. 他年纪太小还不能上学。

2.adj./adv.+enough to +v.足够...而能做某事例：He is old enough to go to school. 他足够大了能上学了/他已到了上学的年龄了。

3.so +adj./adv.+that从句如此...以致例：He is so old that he can go to school.通常来说，这三种句型可用于同义句转换，具体如下：too...to... =not 反义词enough to =so...that 否定句例：He is too young to go to school.= He is not old enough to go to school.= He is so young that he can't go to school.too …to …. ; not …enough to…Step 1 看图说话利用课本P36页的图画和提示词练说too…to do 和not … enough to do 句子。

如：1. The snake / dangerous/ hold . / The boy not braveThe snake is too dangerous to hold. The boy is not brave enough to hold it .板书too…to do 和not … enough to do并让学生明确这两个短语的中文意思是“太… 而不能…”。

提醒学生观察这两个句子结构中的形容词用什么形式，to do中的do 可否变换形式。

在准确理解的基础上继续看图说话。

2. The girl / short / get on the elephant. / she / not / tall .3. The elephant / heavy / carry. / The boy / not strong.4. The elephant / fat / go through the gate. / The gate / not wide.5. The monkey / far away / get the bananas. / The bananas / not near.6. The cat/ slow/ catch the bird./ It / cannot run/ fast .Step 2 抛砖引玉板书The snake is too dangerous to hold. The boy is not brave enough to hold it . (改为同义句) The snake is so dangerous that the boy _________ hold it.学生在理解的基础上探求答案，在探求答案的过程中获得新知。

too 与 enough 的区和用法例（1） enough 的用法A在形容之后使用：He failed the exam because it wasn't easy enough.他考不及格，因不易。

（不enough easy）B在名之前使用：He didn' t buy the car because he didn't have enough money.他没那部，因他没有足的。

C 可以用在enough ⋯ for sb．/sth．和enough⋯ to do sth．构之中：She hasn't got enough money for a holiday.她没有足的去度假。

This dress isn't big enough for her.件衣服她来不大。

She's not old enough to live alone.她未到独自生活的年。

（2） too 的用法A too表示“ 于”：I can't go out. It's too hot.我无法外出，太了。

She couldn't answer the questions because they were toodifficult for her.她无法回答，因她来太了。

B 可以用在too ⋯ for sb．/sth．构之中：This skirt is too big for me.条裙子她来太大了。

It's too easy for me.我来太易了。

C 可以用在too ⋯ to do sth．构之中：The exam was too difficult for him to pass.考太了，以至于他无法通。

The box is too heavy for you to carry.个盒子太沉了，你没法扛起。

She i too young to live alone.她年太小了，无法独自生活。

一、enough to的用法1.enough意思是“充分地，足够”，放在名词之前，形容词、副词之后。

例：他跑得不够快。

He didn’t run fast enough.没有足够的食物。

There are not enough food.【拓展】enough也可以做名词，可以解释为“足够，充分”例：I have eaten enough, Thank you. 我已经吃饱了，谢谢。

2.我们可以用“形容词+enough +to do”的结构来描述一个人的品质和能力。

例：He is tall enough to reach the top of the fridge. 他足够高可以够到冰箱顶上。

He is strong. He can lift it. He is strong enough to lift it. 他强壮地可以举起它。

3.这个结构可以用so ……that……(如此……以至于……）代替，that后面加从句He is so strong that he can lift it. 他是如此强壮以至于可以把它举起来。

4.还可以用“形容词+enough for sb. to do ”这个结构表示“……对某人来说足够……”例：这本书很容易，你能够看懂。

The book is easy enough for you to read.练习：( ) 1.I have ____________ to tell you.A.something enough interesting C.something interesting enoughB.interesting something enough D.enough something interesting( )2. He ran and ran, but he couldn’t run _____________ to catch the bus.A.fast enough B,enough quickly C.enough fast D.enough quickly( )3. Mike is twenty years old, he is _______________ drive a car.A.old enough going to C.enough old to go toB.old enough to go to D.enough old to going我的弟弟已经足够大去上学了。