英语中询问别人什么时候回来，让人捎话，问别人要电话号码之类该如何

一般有以下几个句式：

Do you know when he/she will be back?

你知道他/她什么时候回来吗？

Could you give him a message?

你能帮我转达吗？

Could you tell him/her that Chris called, please?

能不能帮我告诉他/她Chris来电话了？

Could you ask him/her to call me back, please?

能不能请他/她给我回电话？

Could you tell me his/her cell phone/mobile phone number please?

能不能告诉我他/她的手机号？

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