A simile becomes a cliche when it is overused. Pretty much any word or sentence formation becomes a cliche when overused, not just similes. An example of this would be saying that someone is "as blind as a bat", which has already become recognizable and widely used, making it a cliche.
In the spring of 1846, a group of nearly 90 emigrants left Springfield, Illinois, and headed west. Led by brothers Jacob and George Donner, the group attempted to take a new and supposedly shorter route to California. They soon encountered rough terrain and numerous delays, and they eventually became trapped by heavy snowfall high in the Sierra Nevada Mountains. Purportedly reduced to cannibalism to survive through the winter, only half of the original group reached California the following year. Their story quickly spread, and before long the term “Donner Party” became synonymous with one of humanity’s most ingrained taboos.
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You use "it's" as a formal Contraction, it's short for 'it is' or 'it has'.
For example, 'it's a wonderful day's
You use "so" when you are describing something
For example, 'it's so hot'
"So" is also another word for "very", which is where the word originally generated. it's often mixed up with "such", but dont worry! you'll learn English alot soon!
The first step in determining the central idea of an informational text is to identify who or what the author is writing about.