按要求转换下列各句，每空一词。

1. I need your help. (改为否定句) 　　

    I ________ ________ your help. 　　

2. We go straight down the hall. (改为祈使句) 　　

    ________ ________ ________ down the hall. 　　

3. He wants to write a letter to his family. (改为同义句) 　　

    He wants to ________ ________. 　　

4. He went to see his friend yesterday. (改为一般疑问句) 　　

    ________ he ________ to see his friend yesterday? 　　

5. — Were you in your office just now? (作肯定和否定回答) 　　

    — Yes, I ________.

    — No, I ________.