您要查找的是不是：
- He is often seen to work a new machine. 有人常看见他操作一台新机器。
- He is working up a sketch into a picture. 他正在把一幅速写加工成一幅画。
- He is working double tides to finish his essay. 他日夜苦干，赶写他的文章。
- He is working in his photographic studio. 他正在摄影室工作。
- He is explaining how a machine operates. 他正在解释机器是如何运转的。
- He is working in a lawyer's company. 他在一家律师事务所工作。
- He is working hard to excel his predecessors. 他正努力超越他的前任。
- He is working hard at this thesis. 他正在努力地撰写论文。
- A policeman wears a uniform when he is working. 警察执行任务时身穿制服。
- He is working as a teacher tomorrow. 从明天起他要做老师。
- He is working in a chemical factory these days. 这些天他正在一家化学工厂工作。
- He is working on a book about Vietnam War. 他正在写一本关于越战的书。
- He is working in a shipping company. 他在一家运输公司工作。
- Now he is working as a toolpusher in this crew. 现在他正在这个队当队长。
- He is working at a new invention . 他正在从事一项新发明。
- He is working on a book about the Vietnam War. （他正在写一本关于越战的书。）
- He is working out the plot of a novel. 他正在构思一部小说。
- He is working hard that he can catch up with the class. 他努力用功，以便赶上班上同学。
- The dentist sequesters the tooth he is working on. 牙科医生把他正研究的牙齿隔开了。
- We do not know where he is working. 我们不知道他在哪里工作。
