you do not need the third s. An apostrophe is placed after the
second s to make it class'
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Yes, an apostrophe is used to form a possessive noun. An apostrophe s ('s) or just an apostrophe (') placed at the end of a noun indicates that something in the sentence belongs to that noun.
Examples:
The hat's band was black silk. (singular possessive)
The Harrises' children are twins. (plural possessive)
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An op'.';9o
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It's not necessarily at the beginning of the word.
The apostrophe is used to represent missing letters and spaces
in slang words. An example is "y'all"