①If weather permits, we shall go there on foot.

　　→Weather_permitting,_we shall go there on foot.

　　②After Mary came back, they discussed it together.

　　→Mary_coming_back,_they discussed it together.

　　5．现在分词作评注性状语

　　有些现在分词在句中没有逻辑主语，它们往往作为句子的评注性状语来修饰整个句子，表明说话者的态度、观点等。例如：generally speaking"一般来说"， judging by/from ..."从......判断"，taking everything into consideration"从全盘考虑"。

　　Judging from his behaviour, he must be mad.

　　从他的行为来判断，他一定是疯了。

　　Ⅰ.单句语法填空

　　1．Having_selected (select) the proper present, they sent it to their respectable professor.

　　2．Not knowing (know) what to do, the children had to wait for their parents to come back.

　　3．Hearing (hear) the signal, people ran out of the building.

　　4．Judging (judge) from the appearance, it is very peaceful, but in fact, a war will break out soon.

　　5．The decision_having_been_made (make), what is to be done now is how to carry it out.

　　6．Working (work) harder at English, you'll make greater progress.

　　7．When exploring the cave, they found a valuable mineral.

　　8．It being (be) Sunday, many people go to the gymnasium to do physical exercises.

　　9．Looking (look) out through the window, we saw a beautiful scenery.

　　10．The case shocked the public, causing (cause) a hot debate over human nature on the Internet.

　　Ⅱ.单句写作

　　1．Personally_speaking,_I'm satisfied with your performance.

　　就个人而言，我满意你的表现。

　　2．The film star intended to leave quickly, only_to_be_surrounded_by_his_fans.

　　这位影星想迅速离开，却被他的粉丝包围了。

　　3．Football is played all over the world, making_it_a_popular_sport.

　　全世界都踢足球，因此踢足球成了一种很流行的运动。

4．There_being_no_customers,_they closed the store.