【正文】
ot count. For example, we cannot say a bread. Explain Reason 2 slowly to make students understand what a countable noun and an uncountable noun are. (2) milk juice cola carrot Reason 1: Milk, juice and cola are drinks. Carrot is a kind of vegetable. Reason 2: Milk, juice and cola are uncountable nouns. Carrot is a countable noun. (3) photo potato tomato mango Reason 1: Potato, tomato and mango are something that we can eat. But we can’ t eat photo. Reason 2: We should add “ es” to potato, tomato and mango to form their plural forms. But we just add “ s” to photo to form its plural form. (4) man policewoman child toy Reason 1: Man, policewoman and child refer to people. Reason 2: The plural forms of man, policewoman and child are irregular. The plural form of toy is regular, just plus “ s” . Step 2 Presentation 1. “ A” or “ an”. T: Do you know w