留学群专题频道肯定句栏目，提供与肯定句相关的所有资讯，希望我们所做的能让您感到满意！ 对事物作出肯定判断的句子叫肯定句。对事物作出否定判断的句子叫否定句。肯定句和否定句句式转换的原则是不能改变原意。转换的要点是否定词的运用：保持原意则加两个否定词；变成相反的意思则加一个否定词。另外要注意反问句也是一重否定。
出国留学中考网为大家提供中考英语复习资料：肯定句变否定句的基本方法，更多中考资讯请关注我们网站的更新!
中考英语复习资料：肯定句变否定句的基本方法
1. be动词的否定式
be 动词根据不同的人称和时态有不同的形式，在一般现在时中是am , is , are可用作联系动词，构成否定式时，一律在其后面加否定词not.
He is reading. --- He is not reading. They are from China. --- They are not from China.
2. 情态动词的否定式
情态动词的否定式是在其后面直接加not. 如：
I can swim. --- I can’t swim. He can dance. --- He can’t dance. You should go to school at seven. --- You shouldn’t go to school at seven.
3. 实义动词的否定句
实义动词变否定句时，要借助助动词do , does，在一般现在时中用do或者does其句子结构为：主语+ don’t / doesn’t + 动词原形+其它 例如：
I like pop music. --- I don’t like pop music. He likes running. --- He doesn’t like running.
She does her homework at home. --- She doesn’t do her homework at home
小编精心为您推荐：
...10-27
“We have seen everyone besides Tom's father.”
这句话是“除了汤姆的父亲外，我们还见过其他的人。”
如果把这话误解为：“除了(没见过)汤姆的父亲，其他的人我们都见过了”，那么就大错特错了。反面这个意思应该这样表达：
“We have seen everyone than Tom's father.”
须知介词“besides的含义等于”in addition to“或”as well as“。连词”than“的意思有如介词”except“。例如：
(1) John was left with no choice than to quit.
(除了离开，约翰别无其他选择。)
再比较下列两个句子就更清楚了：
(2) Besides rice, the farmers have produced peanuts.
(3) They have gathered all the crops except / than corns.
上述(2) 的意思是(除了米之外，农夫还生产花生。)(3)的意思却是“除了玉蜀黍之外，他们把其他农作物收割了。”
由上面几个例子看，besides和except / than是不同义的，但是besides如果出现在否定句或疑问句里，意思就和except相同了。例如：
(4) I have no other option besides this one.
(5) Some people care for nothing besides their money.
(6) What can we do besides obeying ?
这三个句子里的“besides”都可由“except”取代之。
由此可见，同一个字词，在肯定句和否定句中的意思会有转变。
与“besides , except”一样，“until”这个字也有类似的麻烦，常常令初学英语的人感到头疼。看看下面例子(7)的意思是(7a)还是(7b)“呢?
(7)We slept until midnight.
a.我们到半夜才睡觉。
b.我们一直睡到半夜(才醒)。
显然(7a)是错的;(7b)才正确。
(7a)的英语句子应该是：
(8)We didn't sleep until midnight.
为什么呢?原因是“until”在肯定句中表示一个动作的终结，如例(7b)，又如例(9)：
(9) Madam Lin slept until her son came home.
“Until”在否定句中才表示一个动作的开始，如例(8)，又如例(10)：
(10) Madam Lin did not sleep until her son came home.
这些句子里的“until”都可以由“till”取代。要注意的是“until”可以在句前出现，“till”就不可以了，因此(11)是对的，(12)是错的：
...
10-26
1. I think she is there.
误：I think she isn’t there.
正：I don’t think she is there.
析：英语中think, believe, expect, suppose等表示信念和揣测的动词，后接that从句时，习惯上将从句中的否定形式转移到主句上，即否定主句谓语，不否定从句谓语。
2. He can sing this song and that one.
误：He cannot sing this song and that one.
正;He cannot sing this song or that one.
析：肯定句中的连词and在否定句中一般要改为or。
3. Tom went to school too.
误：Tom didn’t go to school too.
正：Tom didn’t go to school either.
析：too和also用于肯定句中时，否定句中用either替换。
4. He has had supper already.
误：He hasn’t had supper already.
正：He hasn’t had supper yet.
析：随着对谓语动词的否定，某些副词也要作相应的变动。
5. He had a good rest just now.
误：He hadn’t a good rest just now.
正：He didn’t have a good rest just now.
析：have在表示开会、吃饭、休息、进行体育锻炼等词组中是行为动词，否定句用助动词来完成。
6. Let’s do it.
误：Let’s don’t do it.
正：Don’t let’s do it.或Let’s not do it.
析：let后接的是不带to的不定式，变为否定式，直接在句首前加Don’t或在不定式前加not。
7. He always gets there on time.
误：He doesn’t always get there on time.
正：He never gets there on time.
析：He doesn’t always get there on time意为“他并非老是准时到那儿”，是部分否定，习惯上把句中的副词改为相应的表示否定的副词即可。如：
It often rains here. It seldom rains here.
8. Be here early tomorrow.
误：Be not here early tomorrow.
正：Don’t be here early tomorrow.
析：祈使句的否定，一般在谓语动词前加do not的缩写don’t。
...
10-23
1. I think she is there.
误：I think she isn’t there.
正：I don’t think she is there.
析：英语中think, believe, expect, suppose等表示信念和揣测的动词，后接that从句时，习惯上将从句中的否定形式转移到主句上，即否定主句谓语，不否定从句谓语。
2. He can sing this song and that one.
误：He cannot sing this song and that one.
正;He cannot sing this song or that one.
析：肯定句中的连词and在否定句中一般要改为or。
3. Tom went to school too.
误：Tom didn’t go to school too.
正：Tom didn’t go to school either.
析：too和also用于肯定句中时，否定句中用either替换。
4. He has had supper already.
误：He hasn’t had supper already.
正：He hasn’t had supper yet.
析：随着对谓语动词的否定，某些副词也要作相应的变动。
5. He had a good rest just now.
误：He hadn’t a good rest just now.
正：He didn’t have a good rest just now.
析：have在表示开会、吃饭、休息、进行体育锻炼等词组中是行为动词，否定句用助动词来完成。
6. Let’s do it.
误：Let’s don’t do it.
正：Don’t let’s do it.或Let’s not do it.
析：let后接的是不带to的不定式，变为否定式，直接在句首前加Don’t或在不定式前加not。
7. He always gets there on time.
误：He doesn’t always get there on time.
正：He never gets there on time.
析：He doesn’t always get there on time意为“他并非老是准时到那儿”，是部分否定，习惯上把句中的副词改为相应的表示否定的副词即可。如：
It often rains here. It seldom rains here.
8. Be here early tomorrow.
误：Be not here early tomorrow.
正：Don’t be here early tomorrow.
析：祈使句的否定，一般在谓语动词前加do not的缩写don’t。
...
肯定句推荐访问
