They are preparing for the English exam翻译成中文是： 他们正在准备英语考试
例句
1.We are preparing our english exam.
我们正在准备英语考试.
2.They are busy preparing for the exam.
他们正在忙于应付考试.
3.They are busy preparing for the exam. So are we.
他们在忙着准备考试.我们也是.
4.The students are busy preparing for the exam in december.
学生们正在忙于为十二月份的考试作准备.
5.The whole class is working hard preparing for the exam.
全班都在用功准备考试.