After learning some important grammar points after a period of time, foreigners who study in Mandarin leaning courses should review what they have learned properly. In order to practice the application of interrogatives like 哪儿、哪、什么and 谁, the practice of substituting the underlined segment with them to form a question is a beneficial method.

In the sentence 那是大卫的磁带, 大卫is a person. Therefore, we should raise a question with 谁 like那是谁的磁带. 加拿大 is a name of country. If the students are supposed to substitute it in the sentence 我的同屋是加拿大人, it should be 哪, forming 你的同屋是哪里人. In the sentence 我叫李军, the underlined part can be understood as a name. Accordingly, we can ask question with 什么like 你叫什么名字. 哪儿 is often used in questions indicate specific location. Therefore, it can be used to replace the underlined part in 图书馆在宿舍楼的北边 to form question 图书馆在哪儿？

Of course, if the grammar points are not so systematic, Chinese teachers in intensive Mandarin course in China often review the points by demanding students to complete the sentences using the designated words and expressions given. For instance, if the students are asked to finish the sentence这不是我的书， with the given structure “noun add 的”, the students should complete it like 这本书是他的, showing this book is his. Another example is to use 也to finish the sentence 我不是老师， . Obviously, the answer 他也不是老师 is possible and proper.

Just as those who learn Chinese language all know, there are many different expressions for time inChinese language by using 刻、半、差. Therefore, the practicing way of substituting the given words are helpful. For example, 现在是八点十五分, the underlined part can be replaced as 一刻. 半means half an hour when being used in time. Therefore, we can change the part in 电影六点三十分开始 into 六点半. We can also say 十点差一刻 to substitute 九点四十五分.