Question

she bought a book for me ,为什么是主语谓语间接宾语加直接宾语？

Answer 1

答：及物动词buy的常用搭配结构是：buy sb. sth./buy sth. for sb. 又如：Buy her a watch./Buy a watch for her.
I made a kite for him./ I made him a kite. 我给他做了个风筝。

Answer 2

你好！
英语中的双宾语，一个指人，一个指物。
间接宾语指人，直接宾语指物。
这句话也可以写成：
She bought me a book.
me 指人，做间接宾语
a book指物，做直接宾语

Answer 3

可以改为She bought me a book.主语+谓语+间宾+直宾。

Answer 4

do sb sth的短语很多，如sell sb sth, give sb sth, tell sb sth, teach sb sth, get sb sth, buy sb sth, show sb sth等