误：This lathe¹ can not be used any longer, and that one can't, too.
正：This lathe can not be used any longer, and that one cna't either.
或：This lathe can not be used any longer, neither (nor) can that one.

否定句中的“也”不能译成too,而须用either，或用neither(nor)的倒装句型。

5、你不必为你的军衔和薪金担心。

误：You won't have to worry about rank and pay.
正：You won't have to worry about rank or pay.

在肯定句中用and来连接两个并列成分，表示“和”，但在否定句中and应改为or, 这时否定词对or的前后部分同时加以否定。

6、这些规章制度实在是不完善！

误：How not perfect the rules and regulations are!
正：How imperfect the rules and regulations are!

汉语中的感叹句可用否定式，如：多不光彩呀！多不容易呀！而英语中的感叹句不能用否定式，我们可用反义词或带有否定词缀的词来表示。

7、我认为这不值得一试。

误：I think this is not worth trying.
正：I don't think this is worth trying.

英语中表臆想、猜测的动词think, believe, fancy², expect, guess, imagine, suppose等，如果带有否定的宾语从句，宾语从句中的否定词通常提前，用来否定主句的谓语动词。尤其是think, 按习惯用法，否定词只能置于think前。

8、他来这儿不是为了求得我们的帮助。

误：He came here not to ask us for help.
正：He did not come here to ask us for help.

否定状语时，英语中的否定词一般不直接置于被否定词语前，通常置于谓语动词前。只有当两个部分加以对比时，即“不是……而是”时，否定词才可直接置于状语前。如：他来这儿不是为了求得我们的帮助，而是来给我们提供一些信息。

He came here not to ask us for help, but to give us some information. 即使在这一结构中，英语还是常把否定词置于谓语动词前。

9、他的设计肯定还没完成。

误：He mustn't have completed his design.
正：He can't have completed his design.

对比较有把握的推测，肯定句中用must，而否定句中用can't，对过去的推测，在must和can't后接完成形式。