【1】动名词作主语表示: 一种抽象的习惯/爱好/经验/观点。
Swimming is good exercise.游泳是很好运动。
Learning English well is very important.学好英语很重要。
Getting up early is a good habit.早起床是一个好习惯。
Watching TV is Tom’s mother’s hobby.看电视是汤姆妈妈的爱好。
Keeping a diary every day is part of his life. 每天写一篇日记是他生活一部分。
【2】不定式作主语表示：未完成的将来发生的事件或状态。
To be a pilot is Tom’s dream.成为一名飞行员是汤姆的梦想。
To become a scientist is Jack’s dream.成为一名科学家是杰克的梦想。
To finish the work will take us three days .完成这项工作将会花费我们三天时间。
