I want to buy a cake to her.哪错了

I want to buy a cake to her.哪错了 I want to buy a taddy bear to her.哪错了? 1.I want to buy a birthday cake( )my mum. I want to buy a toy for her .(同义句) I want to buy a toy for her. I want to buy something ( ) her I decided to buy a birthday cake ( )my mother on her birthda I want to buy she a cake这句英语错误在哪儿?原因是什么? I want to buy she a cake.划出错误的地方,还要写出正确的答案 I want( )to buy/buy a car. I want to buy a pencil-box for her.(改同义句）I want to buy ___ _ 句型转换I want to buy her a new bike .(改为同义句）I want to buy _____