① It will be + some time + before…
It won’t be long before humans visit the Mars.
② It is + adj./n.+ for sb to do sth.
It is very important for us to learn computer well, because it has changed our life so much.
He said since it was a new model in China, it was impossible to fix it without the right spare parts.（2008年湖北卷）
③ It is + 被强调部分 + that…
1) It is what Yang Liwei has done that encourages us a lot.
2) Those who like reading extensively say it is through reading that we get our knowledge.
◆ more …than any other 表示最高级
Among the optional courses, spoken English and computer study are more popular than any one else.