Hello! As an expert in English grammar, I'm here to help you with your question about the plural possessive form of the noun "class."
When dealing with possessive forms in English, it's important to understand that they show ownership or a relationship between two entities. The possessive form of a singular noun is made by adding an apostrophe ('). For example, "class" becomes "class's" to show possession. However, when dealing with plural nouns that already end in "s," the rules are slightly different.
For plural nouns that do not end in "s," you add an "es" to the end of the word and then an apostrophe. For instance, "boy" becomes "boys'" to show possession for more than one boy.
Now, let's focus on the word "class." When you want to show possession for more than one class, you first make the noun plural by adding an "es" to form "classes." To show possession, you then add an apostrophe after the "s" at the end of the word. So, the plural possessive form of "class" is "classes'."
Here's a breakdown of the steps to form the plural possessive of "class":

1. Make the noun plural: "class" becomes "classes."

2. Add an apostrophe: "classes" becomes "classes'."

It's important to note that the apostrophe indicates possession, so "classes'" would be used in a sentence where we're talking about something that belongs to or is associated with multiple classes. For example, "The classes' homework is due on Friday."

Now, let's address the reference content you provided. It seems to contain a mix of correct and incorrect information. The correct way to form the plural possessive of "class" is as I've explained above. However, the reference to "grass'" and "grasses'" is a bit misleading. The word "grass" is a non-count noun and doesn't have a plural form, so it doesn't have a plural possessive form either. The possessive form of "grass" would simply be "grass's" if it were to show possession, but this is quite rare in everyday usage because "grass" is not typically used to show possession.

To summarize, the plural possessive form of "class" is "classes'," and it is formed by first making the noun plural and then adding an apostrophe after the "s."

Now, let's move on to the translation into Chinese.

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To form the singular possessive, simply add the apostrophe following the final --s-- (class' and grass'). To form the plural possessives of these nouns, explain that first the nouns must be made plural (classes, grasses), then simply add an apostrophe to the end of the word (classes', grasses').read more >>