“As”是一个多功能词，在英语语法中有多种用途。其中之一是作为连词，连接从句或短语。当“as”用作连词时，其后可以接不同词性的词，包括：

用作连词的“as”后可接什么词性？

名词（可数或不可数）

As a child, I loved to play in the park. As an idea, it's not bad. As the sun rose, the birds began to sing.

代词

As she walked by, I noticed her beautiful eyes. As it turns out, I was wrong. As who would have guessed, the weather was perfect.

形容词

As beautiful as a summer day, she smiled at me. As tall as a tree, the building loomed over the city. As tired as I am, I can't fall asleep.

副词

As quickly as possible, I ran to the store. As slowly as a snail, the car crawled along the highway. As soon as I heard the news, I called my mother.

动词（非谓语形式）

As a result of studying hard, I got a good grade. As expected, I won the race. As advised by my doctor, I took the medicine.

从句

As you know, I'm very interested in art. As I was saying, the situation is quite serious. As if by magic, the problem disappeared.

需要注意的是，在某些情况下，“as”后也可以接句子。例如：

As he walked out the door, I realized that I had never told him my name.