【Skill 5】Listen to identify the differences between two items from expressions that are opposites in form.
From the two expressions following は (contrastive marker), 場合 (case), and ほうは (contrastive marker), which are opposite in form like affirmation and negation, listen for the difference between the two things before は (contrastive marker).
In the following audio, from the affirmation 卵巣がある (has ovaries) and the negation 卵巣がない (does not have ovaries) following は (whereas), the difference between メス (female) and オス (male) before は is explained.
■ メスは卵巣がある一方、オスは卵巣がありません。 (Females have ovaries, whereas males do not.)