While many think they can just sit down and let the essay pour out of their fingertips, essay writing can be quite complicated. It is like an onion with many layers you must manage all at the same time. A professional essay writer will be able to pull it off beautifully, but the average student will likely look like a dunce doing it by pure inspiration. This is not high school, where the teacher was elated if you wrote anything at all, regardless how weak it was.
Prepositions are one aspect of the entire logic of an essay. They are critical to logically associating verbs with nouns and nouns with nouns. For example, “Dr. Patterson ran in the house.” means something different than “Dr. Patterson ran into the house.” In the first sentence, we have the doctor running inside the house, perhaps from one room to the next. We imagine he needs to go to the toilet quickly or something. In the second example, the doctor either entered the house quickly or he collided with it, in which case, he himself would require a doctor.
You can see how the preposition controls the logic of the sentence by controlling the relationship between words. Think carefully through the implications of using one preposition over another. If you do not know which one to choose, do a search Online for sample sentences containing the various prepositions you know could work in the sentence. From context you will see what the logical implications are for each one.
Never take prepositions for granted. This will lead to logical ridiculousness and bad grades.
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