"Good grief" is an expression used to indicate shock, or surprise at an event or a concept. It can also be used humorously.
For example:
"I have fourteen cars."
"Good grief! Why do you have so many?"
November 28, 2013
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You don't. It's an interjection.
"Good grief!"
November 28, 2013
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Both examples already given are correct. However, it is a very old expression. I wouldn't use it if I was you.
November 28, 2013
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