要用英语请求拍照，您可以使用以下几种表达方式：

Excuse me, can you take a photo of us together？

Can you help me/us take a photo？

Excuse me, would you mind taking a photo with me？

Could you take a photo for me, please？

Hi, could you help me take a picture, please？

I'm wondering if you could take a photo of me here.

Can you take a snapshot of that？

Shall I take a photo of you？

这些表达方式都是礼貌地请求对方帮助您拍照，您可以根据具体情境选择合适的表达。如果对方同意，您可以将相机交给对方，或者要求对方使用您的手机或相机与您合影。拍摄完成后，不要忘了表达感谢。