12. Use the appropriate reflexive or personal pronoun. 1. Thad had a wonderful vacation last summer. I really enjoyed

Sure, here"s a detailed answer with step-by-step explanations for each sentence:

1. Thad had a wonderful vacation last summer. I really enjoyed it.
The appropriate pronoun here is "it" as it refers back to Thad"s vacation. The reflexive pronoun "itself" is not used because we are not talking about Thad doing something to himself.

2. What we did was incorrect and we felt ashamed of it.
In this sentence, the pronoun "it" is used to refer back to the action of what we did. It is not a reflexive action, so a personal pronoun is used.

3. When the Smiths came to visit us, they brought their dog with them.
Here, the pronoun "them" is used to refer back to the Smiths, who brought their dog. The reflexive pronoun is not used because the action is not reflected back onto the Smiths.

4. Bill, take the money with you in case you need it.
The pronoun "you" is used to refer to Bill, who is being told to take the money with him. The reflexive pronoun is not used because Bill is not doing any action to himself.

5. That is not our fault. You can"t blame us.
In this sentence, the pronoun "us" is used to refer back to the speaker and other people who are being blamed. The reflexive pronoun is not used because no actions are being reflected back onto the speaker.

6. I have a problem. Could you assist me?
The pronoun "me" is used here to refer to the speaker, who is asking for assistance. The reflexive pronoun is not used as there is no action being reflected back onto the speaker.

7. Sue, help yourself to coffee. It"s on the table.
In this sentence, the reflexive pronoun "yourself" is used to reflect the action of Sue helping herself. This is because Sue is performing an action on herself by taking coffee from the table.

8. Don"t worry about my brother and me. We will take care of ourselves.
Here, the pronouns "my brother and me" and "ourselves" are used to refer to the speaker and their brother. The reflexive pronoun "ourselves" is used to indicate that the speaker and their brother will take care of themselves.

9. The two sisters stood in front of the mirror, looking at themselves.
In this sentence, the reflexive pronoun "themselves" is used to reflect the action of the two sisters looking at themselves in the mirror. This is because the action is being performed on the subject itself.

10. I...
I"m sorry, but the sentence is not complete. Could you please provide the complete sentence so that I can help you with it?