不合格って英語でなんて言うの？

There are a lot of ways to express getting a bad grade on a test but the ones above are more informal, meaning, you might say this to your friend or classmate but you probably shouldn't say it to your teacher, principal, or parent. Students are a rich source of new slang expressions, so you can be sure that there are many new slang terms for failing a test that boring old teachers don't know about. One of the most important uses of slang is to make what you're saying only understandable to your friends!

When it comes to tests and exams it's usually either fail or pass. If you did not pass, you failed. You can express this as "I did not pass the exam" or "I failed the exam", we usually don't say "I was rejected" A request is rejected. In school we usually use grades, a scale from A to F. A is the best, perfect grade and F is the worst. F is failing. But then there is B, C, and D. B is still a passing grade, it means "good", a C us usually sufficient and still passing, but a D is pretty bad. If you receive a D on a test you did poorly but past. An F is failing. That is how it is organized in America.

I failed or I didn’t pass are both exactly the same in meaning. Simple past tense failed or past of auxiliary verb do,did.

When a person does not pass a test, the term "fail" would be appropriate. A casual way of saying someone failed a test is "flunk". For example, you can say: -I failed a test last semester. -I hope I don't flunk the next test.

The three sentences you see above are terrific ways to express that you did not pass a test. In the second sentence you will see the word flunk. This word is an informal verb that means to fail. The second sentence would be appropriate if you are talking with close friends or family, while the first and third sentence are appropriate in a formal setting.