Generally speaking, no matter how many passages the articles have, they can be divided into two parts from the perspective of structure, the part with main point views and the part with evidences to support the viewpoints. In addition, the passengers are connected to each other with certain forms to indicate the relationships between the former passage and the next one such as explanation, extension, strengthening, and correspondence and substitute and so on. Most students know litter about it. Therefore, it is essential to pay attention to some cohesion words between two passages.

Replacement is one of cohesion methods of the passages which mean to use certain form to replace certain part in the previous passage. The purpose of applying this method in reading materials is to avoid the repeat of ten sentences expressing the same meaning so that to make the language clear and simple. If you attend to Chinese school in China, you should know the meaning of the form to replace should be explained rely on the objects of being replaced. The replacement part can be used both in the sentence and the passage.

For example, in the short passage我不知道你能不能见到这封信。也许，它将是一封永远寄不到的信。我多么希望不会是这样的，我也相信绝对不会是这样的, 它replaces 这封信in the former sentence and 这样的implies the short sentence它将是一封永远寄不到的信. The replacement part appears in the sentence will avoid using the same words, phrases or structures repeatedly. In addition, it is also helpful for the readers to remind the elements of the parts being replaced, thus paying attention to the comprehensive reading and comprehension.

Another mistake that the overseas students often make when they learn Chinese online free is to replace with personal pronouns and demonstrative pronouns. In this case, the foreign students need to know clearly about the common personal pronouns like 我、你、他（们）and 大家as well as the demonstrative pronouns like 这、那（儿、些、里）so that they will understand the parts being replaced and how to replace with those words.