专四考试第四部分是语法词汇题共有三十道题，同学们平时复习专四语法知识的同时可以做做专四全真模拟练习题。

　　1. He concluded his speech with a remark that failure ____the mother of success.

　　A. is B. were C.was D.must be

　　2. The design liaison meeting ____ ten days by the time it ends.

　　A. must have lasted B. will have lasted  C. would last D. has lasted

　　3. ____ before we depart the day after tomorrow, we should have a wonderful dinner party.

　　A. Had they arrived B. Would they arrive C. Were they arriving D. Were they to arrive

　　4. As ____ clear from his manners, he is a teacher.

　　A. being B. is C. to be D. been

　　5. Great as Newton was, many of his ideas ____today and are being modified by the work of scientists of our time.

　　A. are to challenge B. may be challenged C. have been challenged D. are challenging

　　答案解析：

　　1. A)

　　【句意】他用“失败乃成功之母”这句话结束了他的发言。

　　【难点】表示客观事实或普遍真理时，句子通常用一般现在时，此类句子的时态不受其它分句时态限制。

　　2. B)

　　【句意】本期设计联络会将持续十天才会结束。

　　【难点】by the time意指no later than the moment that something happens，常与过去完成时和将来完成时连用。

　　3. D)

　　【句意】如果他们能在我们后天离开之前赶到的话，我们就举行一次盛大的宴会。

　　【难点】表示将来不可能发生的事实，常用虚拟语气，主句的谓语为should+动词原形(适用于第一人称主语)或would,could,might+动词原形(适用于其余人称主语);而条件句的谓语应该用should+动词原形，were to+动词原形或直接用动词的过去时(如be 改用were)。

　　4. B)

　　【句意】从他的举止便可以明显地看出，他是一名教师。

　　【难点】as意为“如，照(某种事实或情况)”，在本句中为关系代词，指代第二个分句，as代替整个句子作主语时，谓语动词通常必须用单数。

　　5. C)

　　【句意】尽管牛顿非常伟大，然而他的许多观点当前正受到怀疑，并且当今的许多科学家正在努力对这些观点进行修正。

　　【难点】challenge意为“挑战，怀疑”，常用作及物动词。本句中牛顿的观点受到挑战为一个当前已经发生的事实，故采用现在完成时的被动语态。