第 71 课: 小学和大学-4

The students are doing an experiment. 学生们在做实验。

The students are taking an exam. 学生们在考试。

The students are studying. 学生们在学习。

The students are talking. 学生们在谈话。

The student failed the exam. 学生考试不及格。

The student passed the exam. 学生考试及格了。

The student is taking the exam. 学生在考试。

The students are not taking an exam. 学生们不在考试。