He worked very hard; otherwise he would have failed.
当初他学习非常刻苦，不然他就会不及格了。
He worked hard; otherwise he would have failed.
他努力读书镲，否则他当时一定会不及格。
If he had worked harder, he would have got through the final exams.
如果学习努力些，他已经通过了期末考试。
If he had worked harder, he would have got through the final exams.
如果学习努力些，他已经通过了期末考试。
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