词典释义：

as [æz]

用法：介词、连词

1. 表示作为某种身份或角色，通常与be动词连用。

例句：

1. She works as a teacher in a primary school.

她在一所小学做老师。

2. He dressed up as a clown for the Halloween party.

他为万圣节派对打扮成小丑。

3. As the CEO of the company, he has a lot of responsibilities.

作为公司的CEO，他有很多责任。

2. 表示按照某种方式、方法或标准。

例句：

1. Please do it as I told you.

请按照我告诉你的做。

2. The cake turned out just as I wanted.

蛋糕做得正如我所愿。

3. As expected, they won the game easily.

不出所料，他们轻松赢得了比赛。

3. 表示因为、由于某种原因或情况。

例句：

1. As it was raining heavily, we decided to stay indoors.

由于下着大雨，我们决定呆在室内。

2. He couldn't go to work as he was sick.

由于生病，他不能去上班。

3. As she had no money, she couldn't buy the dress she liked.

由于没有钱，她买不起喜欢的裙子。

4. 表示同时发生的两件事情或情况。

例句：

1. As I was cooking, the phone rang.

我正在做饭的时候，响了。

2. She sang as she danced on the stage.

她在舞台上跳舞的同时唱歌。

5. 表示当…时候，常与时间状语连用。

例句：

1. As we were walking in the park, we saw a beautiful butterfly.

当我们在公园散步时，看到了一只漂亮的蝴蝶。

2. As he was driving home, he heard a loud noise.

当他开车回家的时候，听到了一声巨响。

音标：[æz]

同义词及用法：

1. like：表示相似或类似，常用于比较两个事物。

例句：He looks like his father.

他长得像他父亲。

2. for：表示为了、给予或代替某人或某物。

例句：I bought some flowers for my mom's birthday.

我为我妈妈的生日买了些花。

3. because of：表示由于、因为某种原因。

例句：He couldn't come because of the heavy rain.

由于下大雨，他不能来了。

4. while：表示同时发生的两件事情或情况。

例句：While I was studying, my brother was playing video games.

当我在学习的同时，我的弟弟在玩游戏。

编辑总结：

as作为一个常用的介词和连词，具有多种含义和用法。它可以表示身份、方式、原因、同时发生的情况等，常与be动词连用。同时，它也可以与其他词语搭配使用，表达不同的意思。在写作中，我们需要根据上下文和语境来选择合适的含义和搭配，以避免歧义和误解。