when you are down = when you feel sad
feeling blue = feeling sad
1.S + be + feeling down about something
I'm feeling down about work lately.
She's feeling down about her grades.
2.S + be + upset about something
I'm upset about my friends.
Tom's upset about his boss. He's too hard on him!
3.S + be + sad about something
I'm sad about the situation at work.
Jennifer's sad about her mother.
1.S + be + out of sorts
I'm sorry. I'm out of sorts today. I'll be better tomorrow.
Peter is out of sorts today. Ask him tomorrow.
2.S + do not + feel well
Doug doesn't feel well today.
The staff doesn't feel well about the changes at work.
Idioms Used to Express Sadness
习语是与其字面意思不同的表达。也就是说，It's raining cats and dogs并不是就意味着天上下了狗和猫的雨！
1.S + be + feeling blue about something
Jack is feeling blue about his relationship with his girlfriend.
Our teaching said he was feeling blue about life last night.
2.S + be + in the dumps about something
We're in the dumps about our financial situation.
Kelly is in the dumps about her horrible job.
3.S + feel + down in the mouth about something
Keith feels down in the mouth about his relationship.
Jennifer is down in the mouth this month. I don't know what's the matter.
How to Respond to Someone Who is Sad
I feel you.
I can't believe that. That's horrible / disgusting / not fair
I'm sorry to hear that.
That's too bad.
What can I do to help?
Is there anything I can do for you?
Would you like to talk about it?
What's the matter?
You seem sad. Tell me all about it.
Why the long face?
Colleague 1: Hi Bob. I'm feeling out of sorts today.
Colleague 2: I'm sorry to hear that. What seems to be the problem?
Colleague 1: Well, I'm really upset about the changes at work.
Colleague 2: I know it's been difficult for everyone.
Colleague 1: I just don't understand why they had to change our team!
Colleague 2: Sometimes management does things we don't understand.
Colleague 1: It make no sense! I just don't feel well.
Colleague 2: Maybe you need some time off work.
Colleague 1: Yes, maybe that's it.
Colleague 2: Is there anything I can do to help?
Colleague 1: No, just talking about it makes things better.
Colleague 2: Feel free to talk anytime.
Colleague 1: Thanks. I appreciate it.
Colleague 2: No problem.
Sue: Anna, what's the matter?
Anna: Nothing. I'm fine.
Sue: You seem sad. Tell me all about it.
Anna: OK, I'm in the dumps about Tom.
Sue: Bummer. What seems to be the problem？
Anna: I don't think he loves me anymore.
Sue: Really! Are you sure about that?
Anna: Yes, I saw him yesterday with Mary. They were laughing and having a great time.
Sue: Well, maybe they were just studying together.
It doesn't mean he's leaving you.
Anna: That's what I keep telling myself. Still, I'm feeling blue.
Sue: Is there anything I can do?
Anna: Yes, let's go shopping!
Sue: Now you are talking. A nice new pair shoes would help you feel much better.
Anna: Yes, maybe that's what I really need. Not a boyfriend, but some beautiful new shoes.