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(1)必須(used to express obligation)[pt had to](表義務(wù)，責(zé)任)：I～pay her/keep my word/leave at six.我必須酬謝她/謹(jǐn)守諾言/6點(diǎn)離開?！玱bey the rules要遵守這些規(guī)則;You～take two pills a day/read all your assignments /respect your father's wishes. 你一定要日服兩片藥/看完全部作業(yè)/尊重你父親的愿望。Visitors～not feed the giraffes/park in front of the entrance/walk on the railway line.禁止游人給長頸鹿投放食物/在門前停放車輛/在鐵軌上行走。You mustn't be late again/tell a lie.你不許再遲到/說謊。“M～I(xiàn) go now?”“Yes，you～.”/“No ，you needn't”“我現(xiàn)在就得走嗎?”“是的，你必須現(xiàn)在走?！?“不，你不必現(xiàn)在走?！?/p>

(2)準(zhǔn)是，想必(used to express a probability)(表推測)：He～be ill/exhausted/George.他一定是病了/很累了/喬治。He～be joking/suffering.他一定是在開玩笑/吃到苦頭了。We～have taken the wrong road.我們一定是走錯(cuò)了路。It～have been my brother/have stopped raining.那一定是我的哥哥/雨準(zhǔn)停了。

(3)硬(偏)要(used to express insistence)(表示堅(jiān)持)：If you～leave/phone your sister，do it quickly.如果你堅(jiān)持要走/給你姐姐打電話，就趕快走(打)。I～finish this tonight.我今晚一定要完成此事。Why～it always rain on weekends?為什么老天爺老是在周末下雨?

(4)應(yīng)該(used to express suggestion or advice)(表建議，勸告)：You～come and visit me/come and have dinner with me sometime.你應(yīng)該什么時(shí)候來看我/與我吃頓晚飯。I～ask you not to say that again.我應(yīng)該勸你別再說那件事。

【辨異】must與have to、ought(to)和should的區(qū)別見HAVE TO。