③should / ought to的否定形式表示禁止之意。如:
Children shouldn’t smoke.
④should可表示陈述意见,推出建议或请求;而ought to可以表示劝告之意。如:
You ought to respect your parents.
He suggested that they should leave at once.
(6)will / would
①will 用于各种人称表示“意志”、“意愿”或“决心”等,否定式won’t + 动词。如:
I will tell you all about it.
Tom won’t do such a thing.
②will用于疑问句中,常用在第二称时表示说话人向对方提出“请求”或“询问”如:
Will you please tell her the news when you see her?
③will 表示习惯性的动作,有“总是”、“惯于”的含义。如:
Fish will die out of water.
④would 表示客气的请求、建议或意愿。如:
Would you please be quiet?
Would you like coffee?
⑤would 表示过去反复发生的动作。如:
When I passed my school I would see my teachers who taught me 5 years ago.
(7)need
need 作“必要”讲,既可作情态动词,也可作实义动词。作实义动词时后面的动词不定式要带to,其变化与一般动词相同。如:
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