Abstract Nouns:
* Advice: "He gave me some good advice." (Not "advices")
* Information: "The internet provides a lot of information." (Not "informations")
* Knowledge: "She has extensive knowledge of history." (Not "knowledges")
* Research: "The scientists conducted thorough research." (Not "researches")
* Progress: "We're making slow progress." (Not "progresses")
Other Singular Nouns:
* Furniture: "The furniture in the living room is antique." (Not "furnitures")
* Scenery: "The scenery was breathtaking." (Not "sceneries")
* Equipment: "The gym has new equipment." (Not "equipments")
* Luggage: "He carried his luggage to the car." (Not "luggages")
* Hair: "She has long, brown hair." (Not "hairs")
Some Words That Look Plural But Are Singular:
* News: "I heard the news on the radio." (Not "newses")
* Series: "The TV series is very popular." (Not "serieses")
* Species: "There are many species of birds." (Not "speciess")
* Means: "This is the best means of transportation." (Not "meanss")
* Politics: "She is interested in politics." (Not "politicss")
Important Note:
* Many words can be singular or plural depending on the context. For example, "paper" can be singular ("I wrote a paper") or plural ("I have some papers to grade").
* Some words are often used in the plural form but technically have a singular form as well. For instance, "glasses" (referring to eyewear) is a plural word, but it's technically a singular item.
Always check a dictionary or thesaurus if you're unsure whether a word is singular or plural.