How to use
used to ask or talk about the reason for something
Why are you crying?
Why do we have to take all these tests?
'She wants to meet you.' 'Why?'
'I won't be able to come into work tomorrow.' '
I have no idea why the television isn't working.
Simon loves you - that's why he wants to be with you.
He's angry with me and I don't know why.
we shouldn't be friends.
why on earth/why ever etc
used for emphasis when you are surprised, angry etc
Why on earth didn't you ask me to help?
'I don't want us to be seen together.' 'Why ever not?'
used to introduce a question that shows you do not think it is necessary to do something
Why worry? You can't do anything about it.
Why waste time going to the bank when you can do it all over the Internet?
used to say that you agree with a suggestion
'We could invite John and Barbara.' 'Yes, why not?'
why doesn't somebody do something?
why not do something?
used to make a suggestion
Why don't you bring over a video for us to watch?
Why not relax and enjoy the atmosphere?
used to say angrily that someone should do something
Why don't you mind your own business?
used to ask why a particular person has been chosen or is suffering
Why me? Why can't someone else drive you?
why oh why ...?
used to show that you are very sorry or angry about something
Why oh why did I say those horrible things?
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.
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