1. Whom should I say to?

2. Who should I say to?
3. Whom should I tell?
4. Who should I tell?
5. Who should I tell the story?
6. Whom should I tell the story?
7. Who should say?
8. I don't know who to say.
9. I don't know who should say.

(Which expressions are correct?)

The correct expressions are:

3, 6, 7, 9.

#6 = Whom should I tell the story to OR To whom should I tell the story would be correct.

Sra

All of the expressions you provided are grammatically correct, but some are more commonly used in certain contexts. Let's break them down:

1. "Whom should I say to?" - This is correct grammatically, but it sounds a bit formal or old-fashioned. A more common alternative would be "Who should I say this to?" or simply "Who should I tell?"

2. "Who should I say to?" - While it is grammatically correct, this sentence is a bit ambiguous. It would be better to specify what you want to say. For example, "Who should I say hello to?" or "Who should I say goodbye to?"

3. "Whom should I tell?" - This is a grammatically correct and commonly used expression when you want to know who to give information or news to.

4. "Who should I tell?" - This is also grammatically correct and commonly used. It is more informal and can be used interchangeably with "Whom should I tell?" in many situations.

5. "Who should I tell the story?" - This sentence is incomplete. You need to add an object to the sentence. For example, you can say "Who should I tell the story to?" or "Who should I tell the story about?"

6. "Whom should I tell the story?" - This is grammatically correct, but it sounds a bit formal. It would be more common to say "Who should I tell the story to?" or "Who should I tell the story about?"

7. "Who should say?" - This sentence is incomplete. It needs an object or a verb to be complete. For example, you can say "Who should say it?" or "Who should say goodbye?"

8. "I don't know who to say." - This sentence is incomplete. It needs an object or action. You can say "I don't know who to say it to" or "I don't know who to say goodbye to."

9. "I don't know who should say." - This sentence is complete and grammatically correct. It means you are unsure who should be the one to speak.

Remember, the choice between "who" and "whom" depends on whether the word is functioning as the subject or object in the sentence. "Who" is used as the subject, and "whom" is used as the object. In casual settings, people often use "who" for both subject and object, even though strictly speaking, "whom" is the correct form for the object.