1. Note how 改变 is being used as a noun in this lesson, whereas previously it was taught as being a verb.

a. 从课程中的第一级到目前的第五级，其实我们都能看到一些改变.
b. 那从第二级以后，我们做了哪些改变？

2. We’ve seen 认识 used in the past, in the context of getting to know people. Here it’s being used to describe recognizing characters.

a. 而且这也是一个认识中文字的好机会.
b. 那他们应该认识了不少中文字了
c. 除了听的部分，我们也要给学生认识中文字的机会.

3. 不少 literally means “not a few” and is used to say “many”.