In the section Questions 1, we looked at how to ask direct questions. To make a question, we invert the order of the subject and the first auxiliary verb.
If there is no auxiliary, use part of the verb 'to do'. For example:
However, when we ask for information, we often say 'Do you know…?' or 'Could you tell me….?' These are indirect questions and more polite.
Note that the word order is different. For example:
Note that we don’t use do, does or did. For example:
Use if or whether when there is no question word.
The same changes in word order happen when we report questions. Note that in reported questions, the verb changes to the past: