1. can't stop thinking about somebody/something: to be unable to stop thinking about someone or something, even when you do not want to think about them

备注：''can't stop thinking about somebody/something''常用于非正式的场合，也可写作''can't get somebody/something out of my mind''。

例：

After the first three months of the pregnancy were over, I just couldn't stop thinking about food. （一过了怀孕的头三个月，我满脑子想的都是吃。）

I just can't get that poor family out of my mind. （我满脑子想的尽是那个贫困的家庭。）

2. dwell on: to spend too much time thinking about something sad or unpleasant - use this especially when telling someone not to do this

例：

There's no use in dwelling on problems that we can't do anything about. （一直执着于我们解决不了的问题也是没用的。）

3. brood: to keep thinking for a long time about something that worries you or that makes you angry or upset

例：

Austin sat in the corner brooding and looking sorry for himself. （奥斯丁坐在角落沉思，自怨自艾。）

brood on/over/about

You can't spend all your time at home brooding about the way he treated you. （你不能整天都在家一直想他对你有多么不好。）

4. be wrapped up in: to spend all your time thinking about something that concerns you, for example your work, so that you have no time to think about other things or other people

例：

These days she's so wrapped up in her children she never sees anybody. （这些天来，她满脑子都在想孩子们的事，根本无暇顾及他人。）

Sometimes the professors are so wrapped up in their graduate students, they ignore the undergraduates. （有些教授太关注他们带的研究生，而忽略了本科生。）

5. be preoccupied: to be thinking all the time about something that is worrying you or that is important to you, so that it is difficult to think about anything else

例：

What is being done to end the crisis which has preoccupied the country's political leadership? （国家领导人满脑子想的都是关于这场危机的事，怎么做才能制止这场危机？）

be preoccupied with

My mother was preoccupied with my brother and his illness, so I was allowed to do what I wanted. （我妈妈满脑子想的都是我哥哥的病情，所以我想做什么都行，都没人管。）

6. have something on the brain: to be always thinking about a particular thing - use this when you want to say that someone thinks about something far too much

备注：''have something on the brain''常用于口语中。

例：

It's unbelievable—you have this on the brain 24 hours a day! （难以置信，你怎么满脑子都想的都是这种事！）

7. turn something over in your mind: to think about something carefully and repeatedly, especially something you do not fully understand or that you have not made a final decision about

例：

When Dan left, May stayed there, turning his invitation over in her mind. （丹走后，阿美在那儿思来想去不知道要不要接受他的邀请。）

8. have something on your mind: to be thinking about something all the time, especially because you are worried about it

例：

She has something on her mind, but she won't tell us what it is. （她有很多事情要烦，可是不肯告诉我们具体是什么事。）

"Should we tell Dad?" "No, he's got a lot on his mind right now."（-我们要不要告诉爸爸？ -不要了，他已经有很多事情要烦了。）

be on somebody's mind

Come on, tell me what's on your mind. （来吧，告诉我你在想什么。）