The exclamation mark (!) tends to be over-used by some people. It should be used to mark the end of an exclamatory sentence, phrase or clause, including commands. It can also be used within the body of a sentence to show strong feeling or to emphasise each exclamation. It should not be used to indicate mild exclamations.
An exclamation is a loud remark, expressed with strong feeling, for example, as a protest or cry of pain, e.g. What a mess!
A command is a given order, e.g. Go immediately!
Exclamation marks can also be used to emphasise sound effects, e.g. Thwack!
If an exclamation mark is to be used in a sentence including a quote, it should be within the quotation marks, e.g. “Heigh-ho!” he exclaimed.
One exclamation mark is plenty, using two or three in the same sentence is overkill.
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