1. As mentioned in the lesson, 成 is a post verb that can be appended to many verbs to form new meanings. Many of the examples in the lesson use a sentence pattern of 把 and 成 together.
2. Notice how the Chinese in these examples is a lot more specific than the English meaning:
a. 你可以帮我把错的答案改成对的吗?
b. 他们两个长得太像了. 我常常把哥哥看成弟弟.
c. 妹妹每次都把五块看成十块.
d. 因为他很喜欢唱歌,所以他常常把自己想成是歌星.