四、need与dare的用法对比表

　　对比点 need dare

　　1.情态动词+动词原形

　　1)否定式

　　2)疑问式 He need not (needn’t)go.

　　----Need we do it again?

　　---No, you needn’t do it again. He dare not say so.

　　Dare she go out alone at night?

　　How dare you say I’m unfair?

　　If he dare do that, he’ll be punished.(条件句)

　　I dare say.(固定用法)

　　2.行为动词+带to不定式

　　1)肯定式

　　2)否定式

　　3)疑问式 He needs to go.

　　He doesn’t (does not)need to go.

　　Does he need to do it again?

　　No, he doesn’t need ot do it again. He dares to say.

　　He does not(doesn’t)dare to say.

　　If you dare to jump into the water from here, so dare I .

　　3. did not need to do

　　表示过去没有必要做 She didn’t need to attend the meeting yesterday, and she stayed with her children.(她没有参加)

　　五、should与ought to用法对比表

　　对比点 should ought to

　　1、表“应该” 表劝告、建议

　　You should listen to the doctor’s advice.

　　We should learn from Zhang Hua 表示“有责任有必要”做某事

　　You ought to finish your work before you go home.

　　We ought to help each other.

　　2、表“估计”

　　They should get home by now. 表示“非常可能”的事，可译为“总应该”

　　If we start to work right now, we ought to finish it before lunch.(午饭前应当能干完)

　　注： 1)、should还可在虚拟语气中的使用

　　2). 注意：ought to的疑问式及否定式

　　----Ought he to go? ----Yes, I think he ought to.

　　No, he oughtn’t to.

　　否定式：ought not to a或oughtn’t to do(不说ought to not do)

　　反疑问句：oughtn’t ______?

　　六、shall与will的用法对比表

　　shall Will

　　1. 征询对方意见或请求指示，用于第一、三人称：

　　Shall I (we)…?

　　Shall he (she)…?

　　Where shall I (we)wait for you? 1. 询问对方的意思或向对方提出要求：

　　Will you(please)…? Won’t you…?

　　Would you like to…?(用would替代will更客气)

　　----Won’t you go and see the film?你不去看电影吗?---Yes, I think I will. 不， 我想去。

　　2. 表示说话人的“意愿”有“命令”“警告”“强制”“允诺”“决心”等，用于第二、三人称，要重读。

　　You shall do what I tell you ( to do).

　　我叫你干什么你就干什么。

　　Everything shall be done to save the ship.

　　一定要竭尽全力来拯救这艘船。 表示“意志”“意愿”，用于各种人称：

　　I won’t do anything you don’t like.

　　我不会做任何你不喜欢的事。

　　Would表示过去时间的“意志”“意愿”

　　Shylock would not take the money earlier.

　　夏洛克先前是不肯要钱的。