七、虚拟语气在主语从句中的用法

　　句型：It is (或was) + 形容词(或过去分词) + that …… +should + 动词原

形……

　　句子：It is natural that she should do so. (形容词natural, should+动词原

形do)

常用的形容词：

* natural (自然的), appropriate (适当的),advisable (合适的), preferable (更可取的), better (更好的)

* necessary (必须的), important (重要的), imperative (急需的), urgent (急迫的), essential (本质的), vital (必不可少的)

* probable (很可能的), possible (可能的)

* desirable (极好的)

常用的过去分词(Past Participle):

* required (需要的), demanded (要求), requested (被请求的), desired (要求)

* suggested (建议), recommended (推荐)

* orderd (命令)

1. It is necessary that we (should 可省略,下同）have a walk now.

　　 (necessary, should + have) (表示有需要去散步)

2.It was necessary that we (should) make everything ready ahead of time.

　　 (necessary, should + make) (表示有必要事先做好准备)

3. It is required that nobody (should) smoke here.

　　 (required, should + smoke) (表示要求不要在此抽烟)

4. It is important that every pupil (should) be able to understand the

rule of school.

　　 (important, should + be) (表示重要的是学生都能了解校规)

5. It\'s important that we (should) take good care of the patient.

　　 (important, should + take) (表示重要的是照顾好病人)