If we regard the Chinese language as a building, then the vocabulary would be the bricks and the grammar rules are the structure. Therefore, it seems much important for the Chinese language learners to master some important words and grammar points. For example, the word 迟早is a important adverb to indicate the meaning of sooner or later. It is applied to indicate the following results will absolutely happen with the occurring of the conditions and situations described in the former part. It is usually used together with the worlds like 会and要like交通问题虽然严重，但只要大家努力，迟早总会解决.

The word在于is also an important language point frequently used in daily communication like 中国目前最大的问题在于人口太多. From this sentence, the students who learn Chinese language can see the word在于is a verb to indicate the nature, key or origin of the problem lies. As a result, the former part of this word is usually the nominal phrase while the latter is the objects functioned by noun, verb or clause. You can also say这种朋友的遗憾，在于趣味太窄.

The structure 对…加以 + verb is often listed as the teaching point in Chinese class. 加以is placed before the disyllabic or multi-syllabic verbs to indicate the method of treating or dealing with the things mentioned in the former part. One point needs attention is that this structure is often seen in the formal written language. For instance, 他们对调查结果加以分析之后，发现了产生问题的原因.

The last but not least language point that the students who study in qualified Mandarin program need to master is 否则, which is a conjunction with the meaning of otherwise or if it is not like this. If you pay much attention to the specific sentence with否则like你应该大胆开口讲话，否则就不能提高口语水平, you might have found it is often used with 就, having a relative formal tone.