过渡词是用来连接想法和观点的，想法观点存在句子或段落中。过渡词可以帮助阅读者或聆听者更好地理解你写的（说的）是什么。可以使你要表达的内容更流畅、更清晰。过渡词用在以下场合：
对比however, nonetheless, on the other hand
因果herefore, thus, as a result
让步of course, with this in mind, in view of …
举例to demonstrate, for instance, for example
递进as a matter of fact, in addition, in the first place
看下这2个句子
Attitudes to drug usage in sport are shifting. Fewer athletes use them.
态度是如何转变的？是变得更能接受还是不能接受？适当的过渡词可以让读者更清晰地了解你的想法。
Attitudes to drug usage in sport are shifting.However,fewer athletes are using them.
Attitudes to drug usage in sport are shifting.As a result,fewer athletes are using them.
Attitudes to drug usage in sport are shifting.In conclusion,fewer athletes are using them.
过渡词不同于连接词。标点符号的使用规则也不一样，有2种方式
1 过渡词+逗号+独立分句
2 分号+过渡词+逗号+独立分句
Attitudes to drug usage in sport are shifting;however,fewer athletes are using them.
Attitudes to drug usage in sport are shifting;as a result,fewer athletes are using them.
Attitudes to drug usage in sport are shifting;in conclusion,fewer athletes are using them.
很多过渡词都很实用。很多场合都会用到过渡词来连接你的想法。
过渡词不是用来连接句子的，是用来连接你的想法的。
标点的变换：
Attitudes to drug usage in sport are shifting. Fewer athletes,however,are using them.
Attitudes to drug usage in sport are shifting. Fewer athletes,as a result,are using them.
Attitudes to drug usage in sport are shifting. Fewer athletes,in conclusion,are using them.
有时这样使用是没问题的，第三个例句在语法上是正确的，但是听起来却很怪。In conclusion 应该放在分句的开头。在看些语法和标点都没问题，但是却很难被接受的例子：
Attitudes to drug usage in sport are shifting. Fewer athletes are using them,however.
Attitudes to drug usage in sport are shifting.Fewer athletes are using them,as a result.
Attitudes to drug usage in sport are shifting.Fewer athletes are using them,in conclusion.
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