Core Function Words:
* Prepositions: of, to, in, for, on, with, at, by, from, up, down, into, out of, over, under, around, through, before, after, during, since, until
* Conjunctions: and, but, or, so, because, if, then, although, while, since, as, for
* Articles: the, a, an
* Pronouns: I, you, he, she, it, we, they, me, him, her, us, them, my, your, his, her, its, our, their
* Determiners: this, that, these, those, some, any, all, every, no, much, many, few, little
High-Frequency Content Words:
* Verbs: be, have, do, say, go, get, make, know, think, see, come, want, look, use, find, give, tell, take, work, call, try, ask, need, feel, leave, put, read, write
* Nouns: time, year, people, way, day, thing, man, world, life, hand, part, child, eye, case, woman, head, place, work, school, state, problem, fact, point, kind, number, line, point, government, company, home, group, study, game, system, information, business, example, question
* Adjectives: good, new, first, old, great, big, small, different, high, long, last, important, right, wrong, happy, bad, young, little, own, other, same, real, free, easy, clear, simple, easy, late, early
Words Specific to Certain Fields:
* Science: data, experiment, hypothesis, theory, analysis, research, study, result, conclusion
* Business: market, product, customer, service, company, profit, revenue, budget, growth, strategy
* Technology: software, hardware, internet, website, app, data, cloud, network, code, technology, digital, innovation
Note:
* This is just a sample, and there are many other commonly used words not included.
* The frequency of word use varies depending on context, age, and region.
* The list is not exhaustive and can be further expanded based on specific needs.
To understand which words are most frequently used in a specific context, tools like Google Ngram Viewer and corpus analysis can be helpful.