how many cats are there?-there_one. a.is b.ar
——How many cats are there?
——There is one.
is和are的用法
1.are可以用于第一人称、第二人称、第三人称;is只用于第三人称。
2.are可以用于单数、复数;is只用于单数。
具体用法：
are用在第二人称单数(you)和所有的复数(we，you，they)后面;is用在第三人称单数(he，she，it)后面。
are的过去式是were，is的过去式是was。
扩展资料
用are的不可属名词种类
1. 材质：
wood, metal, glass, paper, cloth, cotton, silk, plastic, concrete, rubber, clay。
2. 气体与液体：
air, gas, steam, smoke, pollution, oxygen; water, blood, sweat, shampoo, paint。
3. 食物、饮料、农作物、固体与半固体日用品：
food, meat, beef, pork, bread, pasta, cheese, ketchup, mayonnaise, chocolate, oil, soy。
sauce; milk, juice, coffee, tea, water, wine, beer; wheat, rice, corn/maize, grass, sugar cane; glue, soap, toothpaste, shoe polish。
4. 由微粒／细条组成，或成片的物质：
dirt, sand, powder, flour, sugar, salt, pepper, cinnamon; hair, fur, skin。
5. 自然现象：
weather, wind, rain, snow, ice, fog, dew, humidity, thunder, lightning, electricity, sunshine, heat, cold, gravity, time。
6. 组合与总称（集合名词）：
furniture, bedding, clothing, underwear, fruit, machinery, housing, traffic, jewelry, medicine, makeup, money, cattle, poultry, equipment, software, baggage, luggage, mail, research,。
homework, grammar, vocabulary, alphabet, information, slang, gossip, feedback, staff, faculty, audience, stuff, junk, garbage。
7. 活动、动名词、疾病：
basketball, tennis, chess, work, sleep, music, leisure; running, swimming, cleaning; cancer, pneumonia, polio。
8. 抽象概念与学科：
truth, happiness, honesty, beauty, death, fun, help, intelligence, knowledge, progress, information, advice; science, history, literature, law, art, religion。
参考资料来源：百度百科——不可数名词
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