Could I ask you about … ? Could you do sth … ? I wonder if … ? Would you mind doing sth …? Would you mind if I did sth …? (这里用did是要匹配前面的would，语法如此) Do you mind if I do sth …?

一般情况下，你可以采用一些柔和的语法结构，比如说 - Could I ask you to+动词: (适用于工场，正式的情况), （而且你可以提问以后加“please”为了增加礼貌程度） - Would you be able to+动词：（比上面的结构更柔和，礼貌） -If it’s not too much trouble…: 有利于礼貌地介绍某个申请 -Sorry to bother you but…: 这样介绍问题或者申请更礼貌，自然，比如说: Sorry to bother you, but do you know where the library is?

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