Foreign learners can learn some common expressions like 还是 and 这几年 in free Chinese lesson. First of all, learners should know that 还是 is an adverb here. When we use it, we often mean to indicate to make a choice after comparing two things. For example, A：我们去上海还是去西安？B：还是去西安吧. Some students may learn from free Chinese lesson that there is no object of comparison in the sentence sometimes. However, you can feel such kind of comparison in the mind of the speaker like 我还是喜欢古典音乐.

In addition, 这几年 is often seen in Chinese sentences when learning Chinese language. It has the same meaning of in recent years with 最近几年. One point you should know is that the interrogative pronoun 几 here represents for approximate numbers below ten. Students who learn in free Chinese lesson may often hear the sentence like 这几年昆明变化很大. 几 is also can be used to describe the temperature.