Recurring revenue is the portion of the revenue that is going to continue in the future. It provides a growing base of revenue on which management can rely while focusing on ways to grow the business.on which, 为什这里要加介词on？
It is increasingly obvious that the planet’s ecology is breaking and there is a need for an intense and global effort to halt and reverse these dreadful trends.”that…breaking是引导主语从句吗？there is a need for ab to…的for an to…都是后置定语吗？
There are so many people in the hall.这句话中in the hall是people的定语，还是状语修饰There are so many people的地点？There are so many people going home.这句话中going home是people的定语，还是伴随状语？
If you look through and the sun is too bright, out of focus and surrounded by a murky haze, the sun glasses are not safe. 这里out of和surrounded是作状语吗？逻辑主语感觉是后面的the sunglasses吗？为什么放在了这个位置，谢谢老师了！
...的宾格），如不需要则可省略。
4、其它的成分（定语、状语）不变。
但在实际解决问题时，我发现第四条并不适用所有情况，例如：
I finished the homework quickly and happily
The homework was finished quickly and happily
I made this cake with eggs ...
...From 1983 to 1988,he was teaching at Yale.某一阶段是指持续性时间状语对吗？（3）The worker has been fixing this chair since 9 o’clock.这句我可以改成The worker is fixing this chair since 9 o’clock.吗？（4）进行体的意义：预计会结束而暂且未结束的情景...