dare, need ① dare作情態(tài)動詞用時(shí), 常用于疑問句、否定句和條件從句中, 過去式形式為dared。 eg. How dare you say such horrible words to me? ② need 作情態(tài)動詞用時(shí), 常用于疑問句、否定句，相當(dāng)于肯定句中一般用must, have to, ought to, should。 eg. Need I finish the work today? Yes, you must. / No, you needn't. ③ dare和 need作實(shí)義動詞用時(shí)， 有人稱、時(shí)態(tài)和數(shù)的變化，在肯定句中，dare后面常接帶to的不定式，在疑問句和否定句中，dare后面可接帶to或不帶to的不定式，而need后面只能接帶to的不定式。 eg. She doesn't dare (to)answer. She needs to cook dinner for her sisters. 五. shall, should ① shall 用于第一人稱，征求對方的意見。 eg. What shall I do ? ② shall 用于第二、三人稱，表示說話人給對方的命令、警告、允諾或威脅。 eg. You shall be punished,you bad boy! 六. will, would ① 表示請求、建議等，使用would使語氣更加緩和。 eg. Would you give me a cup of coffee, please? ② 表示意志、愿望和決心。 eg. I will never do that again. ③ would表示過去反復(fù)發(fā)生的動作或某種傾向。 eg. During that summer, he would visit me every other day. ④ 表示估計(jì)和猜想。 eg. It would be about may when she come back to China. 七. should, ought to ① should表示“應(yīng)該”，ought to表示義務(wù)或責(zé)任，語氣更嚴(yán)重。 eg. I should help her because she is in trouble. You ought to take care of her because she is your daughter. ② 表示勸告、建議和命令，should, ought to可通用，但在疑問句中常用should。 eg.Should I open the window? ③ 表示推測， should , ought to (客觀推測), must(主觀推測)。 eg. She must pass the exam. (斷定) She ought to/should pass the exam.(不太肯定)