這三個詞用法困擾了不少英語學習者。
“should”用來提供建議,比如“That shirt looks great on you. I think you should buy it。”。
“would”則是用來描述不可能或者虛擬的事情,比如“I would love to go to Italy, but I don't have enough money。”,這句話就是在說一件不可能發生的事。而“would”也可以表示委婉語氣,就像這句“Would you like some tea?”
“could”有三種用法:
①描述過去的能力,例:“When I was younger, I could run twice as fast。”
②描述將來可能發生的事,例:“If we work really hard, I think we could save up enough money for a vacation this year。”
③用于禮貌請求,例:“Could I have a cup of tea?”