v．ing形式作主语
[观察例句]
1．Knowing where the ball would go wasn't easy.
2．Shooting with great accuracy was another thing he learnt.
3．In this way，practising day in and day out helped Stephen sharpen his skills.
[归纳用法]
1．v.ing形式作主语表示抽象的经常性的意义。
Reading aloud is very important for us to learn a foreign language.
大声朗读对我们学习一门外语是很重要的。
Going to bed early and getting up early is considered to be a good habit.
早睡早起被认为是一种好习惯。
