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We are (some) teachers. a/an表示一個,只能用在單數(shù)名詞前,當單數(shù)句變復(fù)數(shù)句時,一定要把 a/an去掉,或改為 some/any。 例如: This is a book. These are (some) books. 例如: Is that a pen? Are those (any) pens? 當 名詞作定語 或在介詞短語中作 介詞賓語充當除賓語以外的其他成分時,該 名詞不變 。 例如: He is a boy student. They are (some) boy students. (man 和 woman)除外 。 例如: She is a woman worker. They are (some) women workers. 單數(shù)句變?yōu)閺?fù)數(shù)句時,句式不能改變,即單數(shù)句是疑問句時,變?yōu)閺?fù)數(shù)時,仍然是疑問句。 例如: What39。s this? What are these? 例如: She likes his bike.