8.Have a change of heart
Definition: Change one's mind
改变某人的想法
Fred had a change of heart and invited the young boy into his home.
福瑞德改变了主意，决定邀请年轻的男孩来自己的家。
I wish you would have a change of heart about Tim. He really deserves some help.
我希望你能改变对汤姆的看法。他真的值得你去帮助。

9.Have a heart of gold
Definition: Be very trustworthy and well meaning
非常可靠且好心的
Peter has a heart of gold if you give him the chance to prove himself.
如果你给他一个机会证明自己，皮特会非常可靠的。
You can trust her. She has a heart of gold.
你可以相信她。她非常靠谱。

10.Have a heart of stone
Definition: Be cold, unforgiving
冷漠，记仇的
She'll never understand your position. She has a heart of stone.
她永远不会明白你的处境。她是个铁石心肠的人。
Don't expect any pity from me. I have a heart of stone.
不要期望从我这儿得到任何怜悯。我就是一个冷漠无情的人。

11.Have a heart-to-heart talk
Definition: Have an open and honest discussion with someone
与某人进行坦率且诚实的谈话
I think it's time we had a heart-to-heart talk about your grades.
我觉得，我们是时候就你的成绩来一场促膝长谈了。
She called her friend Betty to have a heart-to-heart talk with her about her problems.
她叫上朋友贝蒂，与她促膝长谈了她的种种问题。

12.Have your heart in the right place / One's heart in the right place
Definition: To mean well, have the right intentions
心怀好意，有正确的意图
Come on, you know John has his heart in the right place. He just made a mistake.
算了吧，你知道约翰是出于好意。他只是犯了个错误而已。

13.Know something by heart / learn something by heart
Definition: Know something such as lines in a play, or music perfectly, to be able to perform something by memory
清楚地记得剧本的台词或音乐，能够通过记忆将其表演出来。
He knew all his lines by heart two weeks before the performance.
在上台表演前的两个星期，他就把自己所有的台词记得滚瓜烂熟了。
You need to learn this piece by heart next week.
你需要在下个星期将这个部分记得滚瓜烂熟。

14.Have one's heart set on something / set against something
Definition: Absolutely want something / Absolutely not want something
非常想得到某事物/非常不想得到某事物
She has her heart set on winning the medal.
她非常想赢得这枚勋章。
Frank has his heart set against his promotion. There's nothing I can do to help him.
弗兰克非常不想升职。我帮不了他。