【正文】
hen to use “ a” and when to use “ an” ? If the countable noun begins with a vowel sound, we use “ an” . If the countable noun begins with a consonant sound, we use “ a” . 2. The plural of countable nouns. T: Do you know how to form the plural of countable nouns? (1) an orange → two oranges。 a brush → three brushes。 a box → four boxes Rule 3: We should add “ es” after the nouns ending in “ s” , “ sh” , “ ch” or “ x” . (4) a photo → two photos。 a tomato → some tomatoes Rule 4: We should add “ s” or “ es” after the nouns ending in “ o” . (5) a knife → two knives。 a policewoman → three policewomen。 3. Have a try! Fill in the blanks with the correct forms of the given words. (1) My grandfather likes to tell _______ (story). (2) Let’s go and buy some ______ (carrot) and ________ (potato). (3) All the ______ (child) enjoy talking to him. (4) We