Vocabulary
Sign “?
What
How
Who
Why
When
Where
Which 
Can
Will
Should

For a yes/no question, the sign “?” can be placed at the beginning or the end of the question. 
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Yes/No Question Examples
Do you want to eat?
Are you ok?


The sign WH can be placed at the beginning or the end of the WH question. There is no need to add the sign “?” for WH questions. 
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WH Question Examples
Where do you live?