`as` 后面可以跟不同的词性，具体取决于你想表达的意思。以下是 `as` 后面可以跟的一些词性及其例句：
1. 名词
例句：Tom is as tall as Jack.
2. 形容词或副词的原级
例句：Her skin was as smooth as silk.
例句：You're as tall as your father.
3. 动名词（动词的ing形式）
例句：I shouted as loud as I could.
4. 名词短语
例句：Take as much time as you like.
5. 介词短语
例句：Some broadband modems have routers in them as well.
请根据你的需要选择合适的词性来使用 `as`