1:他昨天病了,没来上学
He was sick yesterday, didn't come to school.
He was sick yesterday,so he didn't come to school.
He didn't come to school,because he was sick.
Yesterday he was ill, didn't come to school.
2.他学习很用功,结果通过了考试
he studied hard and pass the exam.
3.尽管有很多困难,我们还是设法完成了任务
despite many difficulties, we managed to finish the task.
There are many difficulties, we still managed to finish the task .
Despite many difficulties, we managed to complete the task
4.他刚到达,天就下起大雨来
he arrived than it began to pour with rain