一、肯定句改否定句的方法——一步法1、在be动词后加not。
如：is not ，are not ，am not，was not，were not；2、在can，should，will等后加not。
如：cannot，should not，will not；3、上述都没有的，在动词前加助动词否定形式don’t/doesn’t/didn’t。
4、some 改成any。
二、肯定句改一般疑问句的方法——三步法1、把be动词放在句首，剩下的照抄，（some 改成any，my改成your等）句点改成问号。
2、把can，shall，will等放到句首，剩下的照抄，（some 改成any，my改成yo ur等）句点改成问号。
3、上述都没有的，在句首请助动词Do/Does/Did帮忙，剩下的照抄，（some 改成any，my改成your等）句点改成问号。
三、肯定句改特殊疑问句的方法——四步法1、在一般疑问句的基础上，句首添加一个疑问词即可，可根据划线部分确定是什么疑问词。
2、接着找be动词或can，shall，will等放在疑问词后面，若没有则请助动词do/d oes/did帮忙，写在疑问词后面，how many除外，必须先写物品，再写be动词等。
3、划线部分去掉后剩下的内容照抄，（some 改成any，my改成your等）4、句点改成问号。
总之，要教好句子，首先要给学生渗透句子的纲，学生才可以依葫芦画瓢，有纲可循。
当然，平时还必须增加阅读量，实践量，不断总结经验，培养语感掌握技巧，提高句子的准确性来源：博客2009-06-22 08:56:16标签：英语英语中的部分否定（即不完全否定）有如下一些表示方法：一、all 的否定式：not all…（或：all…not）表示"并非都……"、"不是所有的都……"例如：Not all men can be masters. (= All men cannot be masters.) 并非人人都能当头头。
Not all bamboo grows tall. 并非所有的竹子都会长得很高。
二、both 的否定式：not…both (或：both… not) "并非两个……都……" 例如：I don't want both the books. 我不是两本书都要。
Both (the) windows are not open. 两扇窗子并不都开着。
三、every…的否定式："不是每……都……" 例如：Not every book is educative. (或：Every book is not educative.) 不是每本书都有教育意义的。
Not everyone likes this book. 并非人人都喜欢这本书。
This flower is not seen everywhere. 这花并不是随处可见的。
四、always的否定式："并非总是（并非一直）……" 例如：He is not always so sad. 他并不是一直都这样悲伤。
五、entirely, altogether, completely 和quite 的否定式："不完全……"，"并非完全……" 例如：The businessman is never to be entirely trusted. 不可以完全信任商人。
He felt not altogether satisfied. 他并不完全满意。
I don't agree completely. 我并不完全同意。
What he did was not quite proper. 他做的不十分妥当。
六、all the time 的否定式："并非一直……"、"未必老是……" 例如：A foolish man doesn't make a mistake all the time. 笨人未必老是犯错误。
七、not…and…的否定式，被否定的往往是and后面的那一部分。
例如：He did not speak clearly and correctly. 他讲得清楚但不正确。
This film is not interesting and instructive. 这部电影有趣但无教育意义。
She cannot sing and dance. 她会唱歌但不会跳舞。
如果将and 换成or，not 对其后面的两部分就全盘否定了。
He did not speak clearly or correctly. 他讲的既不清楚也不正确。
如要对上述的all, both, every, always, 以及entirely, altogether, completely, q uite 和all the time 等词作完全否定，那就分别要用与之相对应的全否定词，如no, no ne, neither, no one, never, not (never)… at all 等。
例如：All of them can do it.--- None of them can do it.Both are good.---Neither is good.Everybody likes it. ---Nobody likes it.He is always late. --- He is never late.We don't trust them entirely. --- We never trust them at all.He was here all the time. --- He was never here.来源：博客2009-06-18 09:03:30标签：作文/ 句型/ 英语1. 不用说……It goes without saying that …= (It is) needless to say (that) ….= It is obvious that ….例：不用说早睡早起是值得的。
It goes without saying that it pays to keep early hours.2. 在各种……之中，……Among various kinds of …, … /= Of all the …, …例︰在各种运动中我尤其喜欢慢跑。
Among various kinds of sports, I like jogging in particular.3. 就我的看法……；我认为……In my opinion, …= To my mind, ….= As far as I am concerned, …= I am of the opinion that ….例：In my opinion, playing video games not only takes much time but is also harmful to health.就我的看法打电动玩具既花费时间也有害健康。
4. 随着人口的增加……With the increase/growth of the population, …随着科技的进步……With the advance of science and technology, …例：With the rapid development of Taiwan's economy, a lot of social prob lems have come to pass.随着台湾经济的快速发展许多社会问题产生了。
5. ……是必要的It is necessary (for sb.) to do / that ……… 是重要的It is important/essential (for sb.) to do / that ……… 是适当的It is proper (for sb.) to do / that ………是紧急的It is urgent (for sb.) to do / that …例：It is proper for us to keep the public places clean.It is proper that we (should) keep the public places clean.我们应当保持公共场所清洁。
6. 花费spend … on sth. / doing sth. …例：我们不应该在我们不感兴趣的事情上花太多的时间。
We shouldn't spend too much time on something we aren't interested in.7. how 引导的感叹句例：那至少可以证明你很诚实。
At least it will prove how honest you are.8. 状语从句A) 如果你不……，你就会……If you don't ..., you'll ...例︰If you don't keep working hard, you'll lose the chance.如果你不坚持努力工作，你就会失去这次机会。
B) 如此……，以至于……so … that …例：At that moment, I was so upset that I wanted to give up.当时，我非常伤心，最后都想放弃了。
C) 每当我听到……我就忍不住感到兴奋。
Whenever I hear …, I cannot but feel excited.每当我做……我就忍不住感到悲伤。
Whenever I do …, I cannot but feel sad.每当我想到……我就忍不住感到紧张。
Whenever I think of …, I cannot but feel nervous.每当我遭遇……我就忍不住感到害怕。
Whenever I meet with …, I cannot but fe el frightened.每当我看到……我就忍不住感到惊讶。
Whenever I see …, I cannot but feel surp rised.例：Whenever I think of the clean brook near my home, I cannot but feel sad.= Every time I think of the clean brook near my home, I cannot help feel ing sad.每当我想到我家附近那一条清澈的小溪我就忍不住感到悲伤。