关于“要签名”的英语表达，综合不同场景和需求，以下是常用表达方式及用法说明：
一、基础表达
直接请求 - May I have your signature, please？
- Can you sign this document for me？
礼貌用语
- I would be honored to have your signature.
- It would be great if you could sign this.
二、特定场景扩展
正式文件
- Please sign your name on this line.
- Your signature is required on this contract.
非正式场合
- Can you just sign here？
- This is for my friend, could you throw in your signature？
三、注意事项
名词与动词： 名词形式：autograph（特指名人签名） 动词形式：sign one's name 搭配建议
若需在文件上签名，可搭配：on the dotted line（在线上打叉处签名）
若需附赠信息，可补充：Please make it out to [姓名]
建议根据具体场景选择表达方式，正式文件优先使用"May I have your signature？"，非正式场合可用"Can you sign here？"等更随意的问法。