we left the meeting,there obviously being no point in staying为什么用being

we left the meeting,there obviously being no point in staying为什么用being
we left the meeting,there obviously being no point in staying为什么用being

we left the meeting,there obviously being no point in staying为什么用being
因为后一句是做状语,表示没有理由留下来这种状态.
只要做状语,动词都要用Ing 形式

there being 表示存在

there being短语用作句子的状语，是属于独立主格结构。There being构成独立主格结构，常用作原因状语

首先一个句子里只能有一个谓语也就是动词，这个句子中的动词是left,后半句的being no point in staying 中的being是动词的非谓语形式，在这个句子中充当的是状语

doing sth 作状语的分类作状语的分类作状语的分类作状语的分类 ☆一般来说，-ing形式表示主动、进行；过去分词表示被动、完成。 ☆-ing形式作状语，可以表示时间、原因、结果、条件、让步、行为方式、伴随状况等。
如： ▲doing sth.作时间状语时间状语时间状语时间状语： ﹡Seeing my parents waving in the crowd，I went runni...

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doing sth 作状语的分类作状语的分类作状语的分类作状语的分类 ☆一般来说，-ing形式表示主动、进行；过去分词表示被动、完成。 ☆-ing形式作状语，可以表示时间、原因、结果、条件、让步、行为方式、伴随状况等。
如： ▲doing sth.作时间状语时间状语时间状语时间状语： ﹡Seeing my parents waving in the crowd，I went running to them. ﹡Crossing the road, the old man was knocked over by a car. =When he was crossing the road, the old man was knocked over by a car. ﹡(When) Hearing the news, he got frightened. = When he heard the news, he got frightened. ﹡Having eaten his dinner, the boy rushed out. ﹡Hearing their teacher's voice, the pupils stopped talking at once. ﹡Having received his letter, I decided to write back.
▲doing sth.作原因原因原因原因状语状语状语状语： Being a teacher，you should help your students in every way. Being poor, he couldn’t afford a TV set. Not knowing her address, I can't write to her. Having lived with the girl for 5 years, we all know her very well. Having eaten too much, he couldn’t go to sleep.
▲doing sth.作结果状语结果状语结果状语结果状语：
﹡There is mud and water everywhere, making it difficult to travel from place to place. making it difficult to travel from place to place 是结果状语。 现在分词作结果状语表示一种必然性（自然结果）。
（making 可以改为 which makes，相当于一个前因后果的非限制性定语从句。）
﹡He comes home late every evening, making his wife very angry. 他每天回来得很晚，这是他的妻子很生气。
=He comes home late every evening, which makes his wife very angry.
=He comes home late every evening, and it makes his wife very angry.
﹡Mary failed all her exams, making both her parents very angry. 玛丽未能通过一门考试，这是她父母非常生气。
﹡European football is played in more than80countries,making it one of the most popular games in the world.(NMET1998全国卷)
﹡The child slipped and fell, hitting his head against the door.
﹡Her husband died ten years ago, leaving her with three children to look after.
﹡Their car was caught in a traffic jam, thus causing the delay.
﹡She threw the toy on the ground, breaking it into pieces.
﹡The song is sung all over the country, making it the most popular song
﹡The child fell, striking his head against the door and cutting it.
▲doing sth.作条件条件条件条件状语状语状语状语：
Listening to English every day （If you listen to English every day）， you’ll learn it well step by step. Using your head, you’ll find a good way. Working hard, you’ll surely succeed. Working hard, you'll succeed. Taking the path that leads out of the town, you will come to a lake. Turning to the left, you will find the path leading to the park.
▲doing sth.作让步让步让步让步状语状语状语状语： Working so hard, he failed again. Living miles away, he attended the course. 虽然住在几英里以外，他仍去上课。 Defeated, he remained a popular boxer.
虽然被击败了，他仍是一个受欢迎的拳击手。
☆理解技巧： 分词(短语)用作让步状语通常可转换成由从属连词though, although, no matter…等引导的让步状语从句，如上面两句也可转换成：Although he lived miles away, he attended the course. Thought he was defeated, he remained a popular boxer.
▲doing sth.作方式方式方式方式状语状语状语状语： He came running back to tell me the news. The children ran out of the room, laughing and talking merrily. They eat using the fingers of their right hands. He earns a living driving a truck. 他靠开卡车谋取生。
▲doing sth.作伴随伴随伴随伴随状语状语状语状语： Four people entered the room looking around in a curious way. = Four people entered the room and looked around in a curious way. The boy sat in front of the farmhouse, cutting the branch. All night long he lay awake, thinking of the problem. The six blind men stood there begging for a meal. He sat in the armchair, reading a newspaper. They stood there for half an hour watching the stars in the sky. He sat in the chair reading a newspaper. 他坐在椅子上看报。
Don't you sit there doing nothing. 别什么也不干坐在那里。
He came in, followed by his wife. 他走了进来，后面跟着他的妻子。
（☆过去分词短语也可以作伴随状语）
☆理解技巧： 理解“伴随状语”的关键是要理解“伴随”二字。分词(短语)用作伴随状语时，它表示的动作伴随句子谓语动作同时发生，即句子谓语所表示的动作为主要动作，分词短语所表示的动作伴随性的次要动作。 英语中V-ing形式作伴随状语时,它表示的是一个次要的动作,来对谓语表示的动作加以说明或作为陪衬。一般将其置于句后,可用逗号与主句成分分开。
例如:1.Don’t sit there doing nothing.Come and help me with this table.不要坐在那里什么也不做;过来帮我收拾餐桌

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