Let's have a look at the following sentence:

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Romeo loves Juliet.

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We have two people and two possible questions. We can ask about the subject (Romeo):

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            Who loves Juliet? Romeo.           SUBJECT QUESTION

 

Or we can ask about the object of Romeo's love (Juliet):

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          Who does Romeo love?         OBJECT QUESTION

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In these questions the order is  A   S   V (Auxiliary  Subject Verb). We will use this for questions except when we are asking about the subject (Suject question).

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