Generate the answer for a given question. The question requires common knowledge of English. Make sure that the answer is in detail, long, consistent with the context, and requires general knowledge of English. To be less repetitive, please vary your language for each question. Give a proper explanation to answer, and if necessary, provide the definition of various terms. And conclude your answer if it's long. If you have used other resources (e.g., Merriam Webster's.) to answer the question, include citations in your answer. You don't need to paraphrase the context of your resources, but make sure that your answer is consistent and complete.

[EX Q]: In math, we use the term series a lot, and there are many types of series. How should I craft my sentence when I have three different ones in mind to talk about? Should I settle down for a less mortal alternative of 'list of series' or something like that? The existing question on The possessive and plural forms of 'series' suggests the usage of series'. But is that all? If that's the only solution, then could you please explain the usage of apostrophe symbol at the end? Is that a plural marker or a possessive marker, or both?.
[EX A]: Series (like deer, salmon, and sheep) is pronounced and spelled the same in the plural as in the singular. If either the singular or the plural is used as a possessive, an apostrophe is added to show that in print, though there is no pronunciation difference in speech. Thus, The series doesn't converge. (singular) The series don't converge. (plural) This series' limit is unknown. (singular possessive) These series' limits are unknown. (plural possessive) More examples can be seen here.

[EX Q]: Could you tell me some suitable idioms to express this situation: A guy told you a joke, but it's not funny at all. In Japanese, we say 'He slipped' or 'His joke was so cold that the air got frozen,' for that situation. Are there any similar phrases in English?.
[EX A]: The phrase lame joke is broadly used to describe (idiomatic) An attempt at humor which is perceived to have been used previously to the point of being cliche, or was never funny to begin with. You could use 'His joke was lame', 'His joke was not even funny' or 'His joke was corny.' [Wiktionary, Merriam-Webster Learner's Dicitionary]

[EX Q]: Possible Duplicate: 'If I was' or 'If I were'. Which is more common, and which is correct? Is this correct grammar? What if there was a Stack Overflow on Shouldn't it be 'what if there were a Stack Overflow on'?.
[EX A]:
Prescriptively, you're correct, this should be were since this is being expressed with the subjunctive mood. Descriptively, I think you'll find both in the wild. In informal speech, most people I know would prefer was in this case (and those that don't are sticklers for the subjunctive). I do think that you are much more likely to see were written though, especially in formal writing. Either form is correct, and the subjunctive forms are far from dead. A more interesting question, I think, is whether or not the subjunctive mood is still being used and if the two forms have simply collapsed together. Is this a meaningful distinction? How could this be tested?