▲get on 登上；应付；过日子
The bus came and we got on. 公共汽车来了，我们就上了车。
I am afraid I didn’t get on very well in the exam. 我这次考试恐怕不太顺利。
▲hit on [upon] 忽然想到，想出
She hit on a marvelous idea. 她忽然想到一个妙主意。
At last we hit upon a way of dealing with this problem. 最终我们想出了一个办法来解决这一问题。
▲improve on [upon] 对……作出改进，比……更好
I am unable to improve on his suggestion. 我提不出比他更好的建议了。
I think the film improved upon the book. 依我看，这部电影比原著好一点。
▲knock at [on] 敲（门、窗）
Someone is knocking at the window. 有人在敲窗。
New graduates from high schools and colleges start knocking on employers’ doors. 刚从大中学校毕业的学生开始寻找就业门路。
▲lean on 靠在；对施加压力；依靠
She had to stop and lean on the gate. 她不得不停下来，靠在大门上歇歇。
They lean on each other for support. 他们相互依靠，相互支持。
If we lean on them, we’re bound to get something. 如果我们对他们施加压力，一定能得到点什么。
▲live on [upon] 靠……为生，依靠……生活
She still lives on her parents. 她仍靠父母生活。
The family lived upon a small income. 这家人靠少量收入过活。
▲rely on [upon] 依靠，指望
She cannot be relied on to tell the truth. 别指望她能说真话。
Nowadays we rely increasingly on computers for help. 现今我们越来越依靠计算机协助工作。
▲rest on [upon] 基于，（目光）落在……上
The whole theory rests on a very simple idea. 整个理论基于一个很简单的概念。
His eyes rested upon the new sofa. 他的双眼凝视着那张新沙发。
▲sit on 丢下不管，积压：
Don’t sit on letters requesting our help. 不要积压向我们求助的信函。
They have been sitting on my application for weeks. 他们把我的申请搁置了好几个星期。
▲work on 对……有影响；从事，致力于
Will it work on human beings? 这将对人有影响吗？
He is working on a new novel. 他正在写一部新小说。