本可以成功的英文

I could have passed the exam easily.can这个情态动词，用于完成式，表示对过去未付诸实施的事情的惋惜，即过去能做而没做。如：He could have walked out of the desert.You could have been more careful.In those circumstances we could have done better.If my father hadn't been sick, I could have gone to university.希望我能帮助你解疑释惑。

should be done

本可以做某事couldhavedonesth.应该用shouldhavedone句式。比如：youshouldhavecomehereyesterday.昨天你本该来这里的。（实际上没来）。

Maybe I can.../I could..

1.他发现到处在讨论这个问题He found that this question is discussed everywhere. 2.他既不会唱歌,又不会跳舞He can neither sing nor dance.3.只要我们努力就能取得成功As long as we strive,we can success. 4.他一向很仔细,本不该犯这个错误He is always very carefully,and shouldn't have made this mistake. 5.这些消费品的价格,从几美元到几百美元不等 The price of these goods are from several dollars to hundreds of dollars

would have done