notes-improvementsToEnglish-implicitQuoting

typically i believe one should be careful to give credit by explicitly quoting and attributing when a quotation is used, however there are exceptions, as follows. If:

it is too laborious to note the source of a quote, and/or the nature of the quoting work makes it unimportant to explicitly call the reader's attention to the quote's source, and if the quote it can easily be found via Googling the quote (at the time of writing), then quotation marks should suffice to indicate that it is a quote. In some cases other context indicates a quote, and no quotation marks are needed; for example, if one copies and pastes from comments on forums such as Hacker News, the plaintext copy of each quote will start with a line like "pseudonym n days ago"; this sort of thing indicates the presence of a quote as well as quotation marks.

one is taking notes for oneself that one does not expect to use to produce a 'polished' text (even if the notes themselves will be published) then it can be laborious to distinguish quotes from non-quotes. This is somewhat dangerous as there is always the chance that one will later copy a note verbatim into a draft, but imo such mistakes should be forgiven, provided they are unintentional.

the quote is short

the quote is relatively short and expresses an obvious or easy idea in a straightforward (rather than clever or witty) way

the quote is relatively short and it is strongly suspected that the source of the quote is not the original source, yet the source does not itself cite a source (for instance, if the source is repeating a well-known cliche or joke)

the quote is an example of something, for example, any of the examples on https://en.wikipedia.org/wiki/List_of_linguistic_example_sentences

there are very few other ways to express the idea of the quote (and the idea is something prose-y rather than poetic)

the quote is a definition

the quote is a formal or quasi-formal statement

you are quoting yourself (more generally, one of the authors of the quoting text is also a contributor to the work that is the source of the text; for example, if you wrote something on Wikipedia but then others edited it, you should be able to use the modified version of your own words in a paper that you are co-authoring without quoting; of course there some subjectivity here, as you are a 'contributor' to 'Wikipedia' here but i don't mean for you to implictly quote anything on Wikipedia, only phrasing for which you were a primary author; similarly if others' 'editing' amounts to a wholesale throwing out of what you wrote and writing something else, then although you may still deserve some credit for advancing that discussion, for the purposes of implicit quoting you are no longer a primary author of those words)

you have an arrangement with the author that allows you to claim the words as your own (for example, when drawing from their past speeches, politicians do not have to explicitly quote them, even though often the past speech was written by a professional speechwriter, not by that politician emself) (clearly there are some special situations when ghostwriting is not allowed, eg you can't pay someone else to enroll in school in your place and take your tests for you; these situations are of course excluded)

you have prominently noted that much of your phrasing in some section is taken from one or more sources, and it would be easy for the reader to guess or find out which source a given phrasing has come from. For example, if you are writing a list of principals down and you have said that many of them have been taken verbatim from Wikipedia or from source B or from source C, then the reader can be left to figure out whether a given principal's wording is a quote from Wikipedia or from source B or from source C. If the sources are too numerous to make this easy, you should note what came from what sources if you think the reader would be interested or that the quote being provided is a significant enough contribution that the source deserves explicit credit, but if most readers would be uninterested and the contribution is minor, then you can just provide a list of all the sources later on, without noting which thing came from which source.