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论文代写:Should、Could与Would之间有什么差异?

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我不太清楚should、could与would之间在使用上有何不同。是否能告诉我一下这几个助动词的差异?

回答:

对许多非以英文为母语的人来说,should、could和would确实难以分辨,希望藉由本期电子报能协助您厘清这三个助动词的使用时机。

当内文涉及建议时,可使用should与shouldn't。

当句子的目的在于请求或给予建议时,可以使用should与shouldn't表达。例句如下:

A:I've had a really bad headache for the past week. 

B:That's not good – you should go to the doctor.

A:I want to write more on my paper, but I don't know how. 

B:First of all, you shouldn't spend so much time playing games on the computer. You should block daily writing time and join a writing group instead!

A:I had a fight with my Professor. What should I do? 

B:Hmm… I think you should call her and tell her you're sorry.

当内容谈到以往的能力,可使用could与couldn't。

Could与couldn't分别是「can」与「can't」的过去式。例句如下:

When I was younger, I could run a mile in 7 minutes. Now it takes me 20 minutes!

Yesterday, I couldn't find my wallet anywhere – but this morning I found it.

Last year, he couldn't speak English very well, but now he can .

当内容谈到未来可能性,可用could表达。

以下例句中的could,目的在于表达未来的可能性:

A:Do you have any ideas for our publicity campaign? 

B:Yes, I've got a few ideas. I could put advertisements on Facebook and Google. We could also give out pamphlets in our neighborhood. Maybe John could even contact local TV stations.

若想得体的提出要求,也可用could表达。例句如下:

Could you please open the window? It's hot in here.

Could you turn the music down? Thanks.

Could you make 10 copies of this report, please?

当内容谈到不实际或难得一见的情境时,可用would与wouldn't表达。例句如下:

If I were the president of my company, I would make a lot of changes.

If people were more generous, there wouldn't be so much poverty in the world today.

She would travel around the world if she had more vacation time.

附注:这类语境中,would常简化为「'd」。

If I were the president of my company, I'd make a lot of changes.

若想委婉的提出建议,可使用「would you like…」。

以下的例句皆使用would you like来提出委婉的建议:

A:Would you like anything to drink? 

B:A soda would be great. Thanks!

A:Would you like to join us for dinner? 

B:I'd love to, but I actually have other plans tonight.

A:Would you like to see some pictures from my vacation? 

B:Sure!

请注意,在should、could与would后请勿加上「to」。

错误:You shouldn't to smoke. 

正确:You shouldn't smoke.

错误:We could to order pizza tonight. 

正确:We could order pizza tonight.

错误:I would to buy a new car if I had the money. 

正确:I would buy a new car if I had the money.

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