Sometimes. If the sentence is two independent clauses then they would need either a period or a semicolon. A comma would be used if you had an independent and dependent clause.
Well the top thing is to learn from your mistakes. fix your errors another great way to improve your skills is to read a lot it really helps.
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Some literary devices are:
Irony
Foreshadowing
Use of an anti- hero as the protagonist
One common idea that authors use is the benefit of one party over another. Some other common elements would be Betrayal and Greed/Corruption. Some good dystopian fiction books are The Hunger Games Series, The Divergent Series and The Legend Series.