Below is an instruction that describes a task, paired with an input that provides further context. Write a response that appropriately completes the request.

### Instruction:
Identify the sentence which does not have a subject-verb agreement error.

### Input:
1. The dog seem agitated. 
2. My family are coming over for dinner. 
3. All the guests have been arriving.

### Response:
3. All the guests have been arriving.