为某人买/画/制作 buy/draw/make sth. for sb ; buy/ draw/ make sth. for sb

为某人买一个礼物 buy a gift for someone

为某人买了一个礼物 To buy someone a gift ; Bought a gift for someone

为某人买某物 buy sth for sb ; buy sb sth

为某人买东西 buy sth. for sb ; Buy sth for sb

买为某人某事 buy sth for sb

为某个人买棵树 Buy a tree for someone else