When communicating with Chinese people during the period when you study Chinese in China, you may know people often express the meaning or making mistakes with the word 错误, which usually means the incorrect things and actions and behaviors like 犯错误 and 出现错误. The scope of application of this word is very widely. What’s more, it often used by collocating with the verb 犯. We can also say 他的试卷中错误很多.

There is another word which has the similar meaning with 错误, that is, 差错. It indicates the error or the incorrect results that are made because of the carelessness or inconsiderateness. We often hear people say 有差错. One point you should pay attention if you want to tell them apart is that 差错is often used together with the verb 出to form 出差错.

The group of words长远, 长期 and 长久are also confusing to tell apart because all indicate the time is long. 长久implies the time lasts vey long like 长久打算. The time it indicates can be the past, the present and the future. Besides, foreigners who study Mandarin online should know it can function as the adverbial modifier or predicate. Both 长久and 长远are adjectives, but the latter usually means the time in the future and not used as adverbial modifier. For instance, it is wrong to say 他长远地站在那儿，陷入了深深的思考. We should replace 长远 with 长久.

In addition, the word 长期 is a noun to show the long time. Therefore, it is easy to understand and tell it apart with the others. The most frequently used word should be 长期合作. When mentioning 长远, the students who learn Mandarin should know two more words 永远and 深远. As a verb, 永远 indicates that there is no end and usually used as adverbial modifier like 社会永远是不断发展的. However, 深远 means profound and long lasting. Except for showing the time is long, it can used to describe something is meaningful and influential like 意义深远.