What should I get my mom for her birthday?What should I get my sister?What should we get for Lisa?What should I get my mom for her birthday?What should I get my sister?What should we get for Lisa?这三个句子中 第一句中的for和第三句中

What should I get my mom for her birthday?What should I get my sister?What should we get for Lisa?What should I get my mom for her birthday?What should I get my sister?What should we get for Lisa?这三个句子中 第一句中的for和第三句中
What should I get my mom for her birthday?What should I get my sister?What should we get for Lisa?
What should I get my mom for her birthday?
What should I get my sister?
What should we get for Lisa?这三个句子中 第一句中的for和第三句中的for一样吗?另外 为什么第二句中没有for呢?

What should I get my mom for her birthday?What should I get my sister?What should we get for Lisa?What should I get my mom for her birthday?What should I get my sister?What should we get for Lisa?这三个句子中 第一句中的for和第三句中
一样的~
第二句第三句都是可以加for或者不加for的,因为后面跟的是人.
第一句一定要有for因为后面接的是东西.

两句中for的语法作用和意义是一样的（为了。。。作目的状语）
第二句后面省略了for sth

第一句中是 get sb sth for sth 为了某事给某人买某物
第二句中 get sb sth 给某人买东西
第三句中 get sth for sb 为了某人得到某物

第一句中的get sb for sth的for 指为某物，第三句中get for sb的for 指为某人，不一样。第二句What should I get my sister?中get sb.的for 相当于省略。

一样的~
第二句第三句都是可以加for或者不加for的，因为后面跟的是人。
第一句一定要有for因为后面接的是东西。