1. Write about John, Terry, etc.
2. Write about John, Terry, and so on.
3. Write about John, Terry, and so forth.
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Are they all grammatical?
All are correct, yes. It would be better to use et al. instead of etc. though, since you are referring to people, and etc. (shortened form of et cetera) is referring to things.
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Yes, all three sentences are grammatically correct. They each convey a similar meaning, but there are slight differences in emphasis and style.
1. "Write about John, Terry, etc." - The term "etc." is an abbreviation for the Latin phrase "et cetera," meaning "and so forth." In this sentence, "etc." implies that there are additional names or people to include in the list but are not mentioned explicitly. This sentence is concise and straightforward.
2. "Write about John, Terry, and so on." - Here, "and so on" is used instead of "etc." to convey the same idea of additional unnamed individuals in the list. It adds a bit more informality to the sentence compared to using "etc." This phrase suggests that there are more names that follow but aren't significant enough to mention explicitly.
3. "Write about John, Terry, and so forth." - This sentence has a similar meaning to the previous two but uses "so forth" instead of "etc." or "and so on." "So forth" is a less commonly used term with the same meaning as the other two phrases. It may sound slightly more formal or antiquated compared to "etc." or "and so on."
In conclusion, all three sentences are grammatically correct and convey the idea of additional unnamed individuals to be included in the list. The choice between "etc.," "and so on," or "so forth" depends on the desired level of formality or personal preference.