情態動詞
3) 表示推測、可能性（只用于肯定的陳述句）例如： you’re tom’s good friend, so you must know what he likes best. your mother must be waiting for you now.
4. dare, need
1) dare作情態動詞用時, 常用于疑問句、否定句和條件從句中, 過去式形式為dared。例如： how dare you say i’m unfair?
2) need 作情態動詞用時, 常用于疑問句、否定句。在肯定句中一般用must, have to, ought to, should代替。
例如：you needn’t come so early. ---- need i finish the work today? --- yes, you must. / no, you needn’t.
3) dare和 need作實義動詞用時， 有人稱、時態和數的變化。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。
例如：i dare to swim across this river. he doesn’t dare (to) answer.
5. shall, should 1) shall 用于第一人稱，征求對方的意見。 例如：what shall we do this evening? 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。 you shall fail if you don’t work hard. (警告) he shall have the book when i finish it.(允諾) he shall be punished.(威脅 )
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6. will, would
1) 表示請求、建議等，would更委婉。
例如： will / would you pa ss me the ball, please?
2) 表示意志、愿望和決心。例如： i will never do that again. they asked him if he would go abroad.
3) would表示過去反復發生的動作或某種傾向。would表示過去習慣時比used to正式，且沒有“現已無此習慣”的含義。
例如： during the vacation, he would visit me every other day. the wound would not heal.
7. sho uld, ought to
1) should, ought to表示“應該”，ought to表示義務或責任，比s hould語氣重。
i should help her because she is in trouble. you ought to take care of the baby.
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。
you should / ought to go to class right away.
should i open the window?
3) 表示推測
should , ought to (客觀推測), must(主觀推測)。
he must be home by now. (斷定他已到家)
he ought to/should be hom e by now.(不太肯定)
this is where the oil must be. (直爽)
this is where the oil ought to/should be. (含蓄)
一，選用can, could, may, must, shall, should, will, would, can’t, mustn’t, needn’t或have to
1. there is air around us, thought we ________ see it.
2. your mother is getting better and better. you _______ worry about her.
3. you _______ play football in the busy street.
4. “_______ it be true ?.” “yes. it _______ be true indeed.”
5. tom _______ come to the party tonight, but i’m not sure.
6. _______ you please fetch me some water for me?