Grammar is essential for the learners who study in Mandarin language courses in China to understandChinese language. The pure grammar learning may be boring. So you can learn the grammar points by correcting the mistakes in a certain sentence. For example, in the sentence除非你根本没有认真复习，否则考试结果不可能及格, the meanings of the two clauses are in contradiction. The meaning of 除非X，否则Y means the condition of Y will not happen. Therefore, it should be除非你根本没有认真复习，否则考试结果不可能不及格.
Let’s move our attention to the sentence除非对方是艺术内行或什么大人物，他在构思和手法才讲究一些. The former part of this sentence is correct which is explaining the condition. But we should add上to the later part into在构思和手法上才讲究一些 because we often use在…上if we intend to say in some certain aspects.
For some foreign students who just begin to learn to speak Chinese, they often mix the meanings and usage of 过来and过去. Then, it will be hard for them to find the error in the sentence结果，这些动物重新苏醒了过去，并没有出现明显的副作用. It intends to express the animals come into alive again. So we should use 过来instead of 过去.
If the overseas students have been learning Mandarin Chinese for a long time, it is easy for them to correct the sentence他高兴，同其他人一样高兴，甚至比其他人高兴得不得了. As soon as you see比, you should know it is a comparative sentence. But 比其他人高兴得不得了means only extremely happy and has no comparison. Therefore, it should be replaced by 比其他人更高兴, meaning happier than the others.