We can't see_the (世界上独一无二的事物前必须用定冠词the)sun on a rainy day.The(姓氏复数前加the代表.一家人 )_Greens are on a(泛指)_ visit to a basketball for half an hour on _the playground（固定搭配,在操场上）
We can't see_sun on a rainy day._Greens are on _ visit to a basketball for half an hour on _ play
ground
We can't see_the (世界上独一无二的事物前必须用定冠词the)sun on a rainy day.The(姓氏复数前加the代表.一家人 )_Greens are on a(泛指)_ visit to a basketball for half an hour on _the playground（固定搭配,在操场上）