关于such as 的词性和用法等问题，关键看这个词组怎么用。是把它分解处理，还是作为一个整体？在不同的语境中有不同的分析。以下是我个人的看法：

第一种用法：

such as 整体看待，用作介词，表示“部分列举”，意思相当于like。例如：

Issues such as these were not really his concern.  他其实并不关心诸如此类的问题。

They offer tips on topics such as home safety.  他们就家居安全等问题提供建议。

Venerable dailies such as the Tokyo Times have shut down.  像《东京时报》之类的一些有名望的日报已经停刊了。

I know many of them, such as John, Peter, and Tom.  我认识他们当中的很多人，例如约翰、彼得和汤姆。

I like fruits, such as apples, pears, bananas.  我喜欢吃水果，比如苹果、梨子、香蕉等等。

第二种用法：

such 用作表语，表示“程度”（如此、这般），as 后接不定式表示结果。格式是：be such as to do。例如：

His illness is such as to cause anxiety.  他病得很重,令人担忧。

His injuries were not such as to need a surgeon.  他的伤还不是那种需要外科医生治的伤。

The pain in her foot wasn't such as to stop her walking.  她脚疼,但还不至于不能行走。

Your stupidity is such as to fill me with despair.  你的愚蠢使我深感失望。

His kindness was such as to make us all love him.  他那么厚道,以至于我们大家都喜欢他。

Her intense feelings are such as to move the present into tears.  她的感情如此之切,使在场的人都流下了眼泪。

第三种用法：

such as 看作一个整体，充当关系代词，引导定语从句（另一说是：as 引导比较状语从句）。例如：

A plan such as you propose will never succeed.  像你提出的这种计划永远不会成功。

People such as you describe are rarely seen nowadays.  你描述的这种人现在很少见了。

Dangers of navigation are such as are not avoidable by the exercise of due care.  航海危险是指那些即使注意也不可避免的危险。

（本句的such 是代词，as 是关系代词）