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1·If he doesn't find a solution to his problem soon, he'll surely flunk out of college.

如果他不能很快找到解决问题的办法，他肯定要被学院退学。《柯林斯英汉双解大词典》

2·If he is no good, flunk him.

如果他表现不好，给他不及格。

3·I am going to flunk that exam.

那次考试我不及格。

4·You're going to flunk if you don't study.

如果你不学习你会不及格的。

5·LL: I said you are going to flunk the students.

噢！ flunk就是给他们不及格分数啊，那你还真说对了。

6·I fail/flunk the exam, because I didn't study.

因为我没学习所以考试不及格。

7·If you don't keep on studying you'll flunk out.

如果你不一直念书，你就会留级。

8·If flunk out I can always transfer to Engineering.

一旦不合格，马上可以转工程专业。

9·If you just loaf around in college, you will flunk out.

如果你在大学里无所事事，你会被踢出去。

10·Because of the laziness, the boy was flunk in the exam.

由于懒惰，这男孩考试不及格。