独立分句包括主语、动词并且能独立成句。当两个或者两个以上的独立分句由于连接不正确而形成一个句子时，这个句子就是连写句。
连写句有几种类型。第一种是由于独立分句之间缺少标点或连接词（"and," "but," "for," "or," "nor," "yet," "so"）形成的连写句，如下句：
Miguel thinks he might want to be a doctor he also thinks being a rock star would be fun.
第二种仅以一个逗号连接两个独立分句造成的连写句，就如下例中出现的情况：
The children looked forward to the summer, it was the season when they could play outdoors together.
第三种连写句包括了多个独立分句。这些独立分句串到一起形成一个别扭的句子，如下：
The trip to the amusement park was long and the family had to wait in line when they got there but they all enjoyed it anyway and they wanted to go again sometime and the children told their friends about the rides they had taken.
修改连写句有几种不同的方法。你可以选择能更好地帮助你表达原句本意的修改方法。
一种修改方法是把一个连写句分成两个或两个以上的句子。例如：
Miguel thinks he might want to be a doctor. He also thinks being a rock star would be fun.
另一种方法就是用分号把几个独立分句分开，如下：
The children looked forward to the summer; it was the season when they could play outdoors together.
还有一种方法就是用并列连词（"and," "but," "nor," "or," "for," "yet," "so,"）来连接两个独立分句。除非句子非常短，通常情况下会把逗号放在并列连词的前面，如下例所示：
Miguel thinks he might want to be a doctor, but he also thinks being a rock star would be fun.
在某些情况下，还可以通过加上连接主句和从句的关联词（"because," "although," "when," 和"if"）来修改连写句。例如：
The children looked forward to the summer because it was the season when they could play outdoors together.
通常同一个连写句会有不同的修改方法，就像这个例句一样：
The trip to the amusement park was long and the family had to wait in line when they got there. Still, they enjoyed the amusement park and wanted to go again; the children told their friends about the rides they had taken.
The family had to wait in line at the amusement park after making a long trip to get there, but they enjoyed the park and wanted to go again. The children told their friends about the rides they had taken.
在决定用哪种方法修改更好时，需要考虑句子所表达的观点。是不是某些观点与其它观点相比不太重要？你是不是想以从句或短语的形式把这些观点弱化（也就是那些不能独立成句的从句或短语），而把那些主要的观点以独立分句的形式加以强调。
然而，如果两个观点同等重要，你需要以独立句的形式来表达。你可以把它们分成两句话来表达，或者用恰当的标点以及（或者）并列连词来连接两个观点。
An independent clause has a subject and a verb and can stand by itself as a sentence. When two or more independent clauses are joined incorrectly within a single sentence, the result is a run-on sentence.
There are several types of run-on sentences. The first type of run-on sentence is missing a punctuation mark or linking conjunction ("and," "but," "for," "or," "nor," "yet," "so") between the independent clauses, as in this example:
Miguel thinks he might want to be a doctor he also thinks being a rock star would be fun.
The second type of run-on sentence uses only a comma to join two independent clauses, as in as in this example:
The children looked forward to the summer, it was the season when they could play outdoors together.
The third type of run-on sentence consists of multiple independent clauses strung together to the point of becoming awkward, as in this example:
The trip to the amusement park was long and the family had to wait in line when they got there but they all enjoyed it anyway and they wanted to go again sometime and the children told their friends about the rides they had taken.
Run-on sentences can be fixed in different ways. You should choose the way that will best help you express the intended meaning of the original sentence.
One approach is to separate the independent clauses into more than one sentence, as in this example:
Miguel thinks he might want to be a doctor. He also thinks being a rock star would be fun.
Another approach is to add a semicolon to separate the independent clauses, as in this example:
The children looked forward to the summer; it was the season when they could play outdoors together.
Yet another approach is to add a coordinating conjunction ("and," "but," "nor," "or," "for," "yet," "so,") to connect the two independent clauses. Unless the sentence is very short, a comma is usually placed before the coordinating conjunction, as in this example:
Miguel thinks he might want to be a doctor, but he also thinks being a rock star would be fun.
In some cases, adding a subordinating conjunction, such as "because," "although," "when," and "if," may help to correct the sentence, as in this example:
The children looked forward to the summer because it was the season when they could play outdoors together.
Often there is more than one way to correct a run-on sentence, as in this example:
The trip to the amusement park was long and the family had to wait in line when they got there. Still, they enjoyed the amusement park and wanted to go again; the children told their friends about the rides they had taken.
The family had to wait in line at the amusement park after making a long trip to get there, but they enjoyed the park and wanted to go again. The children told their friends about the rides they had taken.
To decide which is the best way to correct a run-on sentence, think about the ideas in the sentence. Are some of the ideas less important than others? You may want to de-emphasize these ideas by making them into dependent clauses or phrases (that is, clauses or phrases that cannot stand on their own) while keeping the important ideas as independent clauses.
However, if the ideas are equal in importance, you may want to keep them as independent clauses. You can either separate them into two sentences or else join them with the correct punctuation and/or coordinating conjunctions.