两个点决定一条直线；三个点决定一个平面。
我们写英语句子crowds，也有类似原理。
一主一谓（或者说一名一动）crowds，就是一个简单句、一条直线。
多出来任何一个成分，或者多个成分，就要用到连词（如and）。
所以说，主语、谓语、连词——这是三个最基本的“点”。
用这张图看更形象——
图中，人是主语、剑是谓语（动词）、链子是连词。最基本的句子构成有这三种可能：
第一行：最简单的句子：SV
第二行：较复杂的句子：SV 连V
第三行：更复杂的句子：SV 连SV
主语在前、谓语在后，就是“人——剑”；如果反过来了那就成了“贱（剑）——人”。（当然倒装的情况有，这是后话暂且不表。）
连词的位置比较灵活，但总在两个链接内容之间：主连主；谓连谓；或者：主谓连主谓。（也叫：人连人、剑連剑、人剑连人剑。搞错了就变成“连人人”“连剑剑”、“贱人连贱人”啦！）
下面看这篇文章。暂且不论文采什么的，甚至小的语法错误也暂且不管他。至少句子能让我们知道人家在说什么。
【例文全文】
At the beginning of the fight, Bertha dressed in pink, raced forward and jumped into the ring.She waved to the crowd and everybody cheered to her. Then, Fiona dressed in black, crashed her way towards the ring. She shook her fist to Bertha but everybody booed to her. During the fight, Fiona and Bertha gripped each other by the shoulders, and then. Fiona threw Bertha over her shoulder. Of course she is the winner of the fight, all the people cheered to her. After the fight, a little man gave the flowers to the Bertha and Fiona felt very sad. Finally,they had a promise: they toss a coin to decide their hair colour. But nobody in the crowds that come towatch them fight has ever noticed.
【逐句点评】
1.At the beginning of the fight, Berthadressedin pink, raced forward andjumpedinto the ring.
这个句子符合上面第二种情况。连词用的好。
2.She waved to the crowd andeverybodycheeredto her.
这个句子符合上面第三种情况。连词用的好。
3.Then, Fionadressedin black, crashedher way towards the ring.
这个句子不符合上述公式，缺少了连词and。
4.She shook her fist to Bertha buteverybodybooedto her.（同2）
5.During the fight, Fiona and Berthagrippedeach other by the shoulders, and then. Fiona threw Bertha over her shoulder.
比照上面第三种情况：三要素都有，可是被标点符号给毁了！
6.Of course she isthe winner of the fight, all the peoplecheered to her.
两句之间少了连词。
7.After the fight, a little mangavethe flowers to the Bertha andFionafelt very sad.
符合上述第三种情况。
8.Finally, theyhada promise: theytossa coin to decide their hair colour.
也符合上述第三种情况——只要不是逗号，都能起到连词的作用！
9.But nobodyin the crowds thatcometo watch them fight has ever noticed.
符合上述第三种情况。含有一个“定语从句”。（以后再讲这个问题）
这篇文章里的句子，就是有直线、有平面。起码能让人“看懂”。三个“点”用的基本到位。否则就会是这样的——
She thought that Berthawas notwin.
后面一句多了一个谓语：主谓谓，人贱贱。
改作：She thought that Berthadid not win.
看看这句哪里错了：Fiona saw that She was agree Bertha' ssuggestion.
Berthainthe garden.
有主语，没谓语。有人无剑！改作：Berthawasin the garden.或者也可能是stood、walked、played……总之她在花园里干什么？
Later therewasa man gaveBertha the flowers.
一主两谓——一人两剑，crowds你行吗？
改作：Later there was a man who gaveBertha the flowers.
或者：Later there was a man and hegaveBertha the flowers.
以后学习了非谓语动词知识，这句话还可以是
Later therewasa man givingBertha the flowers.
WhenFionawent on.
连主谓——连人剑，跟谁连连看呢？这是典型的“半句话”。好比中文说“当你老了……”、“如果我有钱了……”然后没下文了。
改作：Fiona went on（Fiona继续。）
或者：When Fiona went on，Bertha stopped her……
初学者的句子结构错误，大半是上面这四种类型：
一、双谓语。
二、缺谓语。
三、There be句型加谓语。
四、半句话。
谁不曾中过招？
