What are some special nouns plural in form but singular meaning sentences?

You're asking for examples of nouns that are plural in form but singular in meaning, also known as singularia tantum. These words are interesting because they don't change form even when referring to one thing.

Here are some examples:

Common Examples:

* News: "The news is bad today." (Not "The news are bad today.")

* Politics: "Politics can be a dirty game." (Not "Politics are a dirty game.")

* Physics: "Physics is my favorite subject." (Not "Physics are my favorite subject.")

* Measles: "Measles is a highly contagious disease." (Not "Measles are a highly contagious disease.")

* Economics: "Economics is a challenging field." (Not "Economics are a challenging field.")

* Statistics: "Statistics show a decline in crime rates." (Not "Statistics show a decline in crime rates.")

* Athletics: "Athletics are an important part of a well-rounded education." (Note: This is one of the few exceptions, it can be used in both singular and plural forms)

Less Common Examples:

* Billiards: "Billiards is a game of skill and strategy."

* Darts: "Darts is a popular pub game."

* Mumps: "Mumps is a viral infection."

* Ethics: "Ethics is a fundamental principle of good behavior."

* Series: "The new series is a huge hit."

Things to Remember:

* Some words that are plural in form, but singular in meaning, can be used as plural nouns in different contexts. For example, "trousers" can be singular in "A pair of trousers" but plural in "These trousers are too small."

Let me know if you'd like to explore more examples or have other grammar questions!