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?