Ví dụ:

           Do you sleep at least eight hours a day?’ the doctor asked him.

      → The doctor asked him if he slept at least eight hours a day

b. Wh – question.

Ví dụ:

          Our teacher asked us, ‘What are you most worried about?’

          ->Our teacher asked us what we were most worried about

2. Question words before to-infinitives 

Các từ để hỏi “who, what, where, when và how” có thể được sử dụng trước một động từ “ to-infi native” để diễn tả tình huống khó hoặc không chắc chắn.

Một số động từ được dùng trước các từ để hỏi + to infinitive:

ask, wonder, (not) be sure, have no idea, (not) know, (not) decide, (not) tell.

Ví dụ:

         I don’t know what I should wear!

   →  I don’t know what to wear.

Ví dụ:

        Could you tell me where I should sign my name?

   → Could you tell me where to sign my name?

Ví dụ:

          ‘How should we use this support service?’ they wondered.

      → They wondered/couldn’t tell how to use that support service

Ví dụ:

        ‘Who should I turn to for help?’ he asked

    → He had no idea who to turn to for help.