if you don't be careful,you will fail in the exam.和if you aren't careful.哪个对?if you don't be careful,you will fail in the exam.和if you aren't careful,you will fail in the exam.

if you don't be careful,you will fail in the exam.和if you aren't careful.哪个对?if you don't be careful,you will fail in the exam.和if you aren't careful,you will fail in the exam.
if you don't be careful,you will fail in the exam.和if you aren't careful.哪个对?
if you don't be careful,you will fail in the exam.和if you aren't careful,you will fail in the exam.

if you don't be careful,you will fail in the exam.和if you aren't careful.哪个对?if you don't be careful,you will fail in the exam.和if you aren't careful,you will fail in the exam.
正确的是：if you aren't careful,you will fail in the exam.

意思一样，只不过you aren't careful更简单，更通俗，更口语化。

没区别 就是两句话都很中式英语 careful的意思是you behave sensibly so that you do not have an accident, do any damage to anything, make a mistake. 用careful就不对。你可以说If you don't study hard for the exam, you are going to fl...

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没区别 就是两句话都很中式英语 careful的意思是you behave sensibly so that you do not have an accident, do any damage to anything, make a mistake. 用careful就不对。你可以说If you don't study hard for the exam, you are going to flunk it.

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