能告诉我what do you want to be 和 what do you want to do?的区别

what do your parents do? 你父母是做什么的？
回答： my father is a worker. he works in a big company. my mother is an english teacher. she works in no.1 middle school.

do they like their work? 他们喜欢他们的工作吗？
回答： yes, they do. they like their work very much and they work very hard.

what do you want to be?why? 你想做什么？为什么？
i want to be a teacher because being a teacher is very interesting and wonderful. i can teacher the student and learn from them as well. i can also have lots of holidays so that i can do whatever i want, such as traveling, reading books and so on.