Consolidation
1.照顾老人是重要的.
It's important to take good care of the old.

2.学英语是有用的.
It's useful to learn English.

3.一小时内完成这份工作是可能的.
It's possible to finish the work within an hour.

4.上数学课是有趣的.
lt's interesting to have maths lessons.

5.吃蔬菜是健康的。
It's healthy to haveleat vegetables.