Basic Guidelines For English Spellings
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The main use of the exclamation mark is to end sentences that express:
Ow! That hurt!
Hello! How are you?
‘Look up there!’ she yelled.
Included on the list of banned items was 'crochet hooks'!
She says she’s stopped feeling insecure (!) since she met him.
People tend to use a lot of exclamation marks in informal writing such as emails or text messages, but you should avoid using them in formal writing.
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