这三个词用法困扰了不少英语学习者。
“should”用来提供建议，比如“that shirt looks great on you. i think you should buy it。”。
“would”则是用来描述不可能或者虚拟的事情，比如“i would love to go to italy, but i don't have enough money。”，这句话就是在说一件不可能发生的事。而“would”也可以表示委婉语气，就像这句“would you like some tea?”
“could”有三种用法：
①描述过去的能力，例：“when i was younger, i could run twice as fast。”
②描述将来可能发生的事，例：“if we work really hard, i think we could save up enough money for a vacation this year。”
③用于礼貌请求，例：“could i have a cup of tea?”
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