大学英语四级考试高频词汇精选精学课程第1讲

　　词汇、语法的掌握是应对大学英语四六级考试的基础，英语常用到的词汇，为备战英语四六级做准备。

　　It be essential that 后面一定用虚拟语气，且句子谓语动词固定为 + 动词原型;

　　It was essential that the applications forms send back before the deadline.

　　53. We _D_ our breakfast when an old man came to the door.

　　A just have had B have just had C just had D had just had

　　when 还可以表示①刚..就 、②恰在此时;

　　44. I had just started back for the house to change my clothes _D_ I heard voices.

　　A as B while C after D when

　　45. I felt somewhat disappointed and was about to leave, _C_ something occurred which attracted my attention.

　　A unless B until C when D while

　　64. It was essential that these application forms _D_ back as early as possible.

　　A must be sent B will be sent C are sent D be sent

　　非谓语动词与独立主格：短语，句子

　　1.当短语部分有独立主语，并且该主语不同于句子主语，这时短语结构称为独立主格。。

　　独立主格的结构1：名词+ 分词

　　现在分词表示主动的，正在进行的行为;过去分词表示被动的，已经完成的行为。 作题时要通过判断动作与名词之间的关系来确定是使用现在分词还是过去分词。当动作由名词发出时使用现在分词，而名词是受动者时则用过去分词。

　　54. Silver is the best conductor of electricity, copper _B_ it closely.

　　A followed B following C to follow D being followed

　　49. All things _A_, the planned trip will have to be called off.

　　A considered B be considered C considering D having considered

　　call off 取消; cancel vt. 取消; 四级中的考点就是现在分词和过去分词的区别。

　　独立主格的结构2：with + 名词+ 分词

　　36. After the Arab states won independence, great emphasis was laid on expanding education, with girls as well as boys _C_ to go to school.

　　A to be encouraged B been encouraged C being encouraged D be encouraged

　　as well as 和; be encouraged不会考。

　　动词不定式有预示将来行为的含义。to be encouraged 将要被鼓励;

　　been encouraged 已经被鼓励完了，与主句的谓语动词相对;being encouraged 正在被鼓励

　　2.短语部分没有独立主语，则短语结构称为非谓语动词。

　　非谓语动词的结构：分词

　　句子的主语决定非谓语动词中的分词是用主动还是被动形式。如果是句子的主语发出动作，则使用现在分词;如果动作不是由句子的主语发出，则使用过去分词。