buy sb sth的意思是给某人买某物;为某人买某物
My mother buys a book for me.
我妈妈给我买了本书.
My mother bought a new computer for me as my birthday present.
我妈妈给我买了一台新电脑作为生日礼物。
（buy-bought-bought buy的过去式和过去分词）
Ne come rain come shine rain or shine take a shine to sb sth I'll buy a house in the country when my ship comes in.等我有钱时，我要在乡间买一所房子。
Out at sb sth not know what hit oneThey sang their latest hit.他们唱了最新流行歌曲。
Laugh sb sth out of court pay court to sb put sth out of court take sb to courtading role in the play.他一直在讨好导演，想在剧中扮演主角。
Rd hard by sth hard done by hard on sth hard on sb's heels hit sb sth hard take sth hardHe became hardened to the suffering around him.他对周围的苦难现象已经见怪不怪了。
Nd of sb sth that's what I'd like to know likes and dislikes. It's just like her to tell everyone about it.只有她才会把那件事见谁就告诉谁。
Call sb sth to order get one's give sb his marching orders in apple pie order in running working orderbook in stock but we can order it.这书我们没有存货，但是可以预订。
本回答被网友采纳1). My mother bought a school bag for me.
2). She will buy a gift for her mother.
3). He buys his mother a bunch of flowers.
My mother buys a book for me.
我妈妈给我买了本书.
My mother bought a new computer for me as my birthday present.
我妈妈给我买了一台新电脑作为生日礼物。
（buy-bought-bought buy的过去式和过去分词）