The rules concerning the use of apostrophes in written English are very simple:
1. They are used to denote a missing letter or letters, for example:
2. They are used to denote possession, for example:
This applies to all nouns, so the correct versions are Jesus's disciples, Keats's poems and so on.
Please note that “Its”, which is usually used as a possessive adjective (like “our”, “his” etc), does not take an apostrophe:
... however, if there are two or more dogs, companies or Joneses in our example, the apostrophe comes after the 's':
3. Apostrophes are NEVER ever used to denote plurals! Common examples of such abuse (all seen in real life!) are:
Note: Special care must be taken over the use of “your” and “you're” as they sound the same but are used quite differently:
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