decide to do sth决定做某事，例句：

Mr Smith decided to buy a new computer.

这个句子的同义句可以写成：

Mr Smith made a decision to buy a new computer.

Mr Smith made his mind to buy a new computer.

那么diecide to do sth=make a decision to do sth= make one's mind to do sth这三个是同义句，在使用时可以互换。