[直观分析]

What（特殊疑问代词前置句首，作介词in 的宾语） have （助动词与主语倒装）you （主语）been interested （系表结构）in （介词）for as long as you can remember（介词短语，作时间状语，说明have been interested 的持续时间）?

[几点说明]

（1）What have you been interested in：你对什么感兴趣？现在完成时表示：从过去某时开始一直持续至今。

（2）for long：介词短语。表示be interested“持续的时间”。

（3）在for 后面用了一个比较从句：as long as you can remember （像你所能记忆的时间一样长，引申为：就你记忆所及），说明“都某事感兴趣”持续的时间，跟remember 的时间“一样长”。

[类似例句]

She has been part of my life for as long as I can remember. 在我的记忆中，她一直是我生活的一部分。

We will fight for as long as it takes.  我们要一直斗争到底。

Go home and rest for as long as you can.  回家休息，休息越久越好。

They might stay on for as long as they wished.  他们可以想呆多久就呆多久。

Keep your voicemail for as long as you like. 可以按照你的意愿保存你的语音邮件。

We can hold this position for as long as the ammunition lasts out. 只要弹药还够用，我们就能守住这个阵地。

I have been learning English for as long as 15 years. 我学英文已有十五年之久。

We can stay here for as long as our supplies hold out. 我们的供应能维持多久，我们就能坚持多久。

The insurance period can be for as long as we agree. 保险期限可以由我们商定。

Chances are, you'll view the error in a purely negative light for as long as any initial shock and discomfort about it continues to exist.

很有可能的是，你将用完全负面的眼光看待这个错误，只要你最初受到的冲击和不安依然存在的话。

Before meeting with lawmakers, Trump said the shutdown would last for “as long as it takes” as he pushes for wall money as part of any legislation to reopen agencies shuttered when their funding lapsed on Dec. 22.

特朗普说政府关门（政府停摆）的时间需要多长就会持续多长。