【正文】 steel works. We’ve built two nuclear power works in our city. species: This is a species of orange. He caught many species of snakes. 7)只有復(fù)數(shù)的名詞 glasses: Your glasses are on your nose. trousers: My new trousers are too long. clothes: These clothes are a little too expensive. noodles: Wanzhou noodles are very delicious. 8)集合名詞的單復(fù)數(shù) 指整體為單數(shù)；指成員為復(fù)數(shù) family。 tomatoes o結(jié)尾的名詞可加 s, es的名詞 zeros。而名詞的難點(diǎn)卻在于其單復(fù)數(shù)的變化方式。 leaf—leaves life—lives。 group。 woman。 editor39。s B. Wangs’ home C. the Wangs D. home of Wang 19. Sister Carrie works in a ____ factory, you know. A. shoes B. shoes’ C. shoe D. shoe39。 sands C. sand。s else39。s B. Men39。 editorsinchief39。 type。 a mu—five mu。 potatoes。 （二）名詞詞類(lèi)的轉(zhuǎn)換 個(gè)體名詞 → 抽象名詞 Our school is not fat from my home. School is over at four in their country. She held some flowers in her hand. The tress are now in flower. 2） 1） 2. 物質(zhì)名詞 → 個(gè)體名詞 Iron is a kind of metal. Please lend me your iron, will you? He broke a piece of glass while cleaning. He broke a glass at the party and was scolded by his mother. 1） 2） 3. 抽象名詞 → 個(gè)體名詞 1） Youth is beautiful and we must value it. 2) He is a youth of twenty but he has made great achievement. → 物質(zhì)名詞 1） I bought a chicken this morning. 2) Please help yourself to some chicken. 3) I have an egg for breakfast with some milk every morning. 4) Egg is my favorite dish and I don’t like meat too much. 5) There is a pine in front of the house. 6) These desks are made of pine. （三）名詞單復(fù)數(shù) s的名詞 (1) 輔音字母加 y結(jié)尾的專(zhuān)有名詞 two Marys。 thief—thieves。 crew。 gentleman等修飾名詞的數(shù)