/əz;strong form æz ||; əz; æz/conj prep adv 1 while sth else is happening 同一时候；当时: The phone rang just as I was leaving the house. 我刚要出门，电话就响起来了。As she walked along the road, she thought about her father. 她沿着那条路走着，心里想着她父亲。
2 as... as used for comparing people or things （用于比较人或事物）: Todor's almost as tall as me. 托多尔差不多跟我一样高。Todor's almost as tall as I am. 托多尔差不多跟我一样高。It's not as cold as it was yesterday. 今天没有昨天那么冷。I'd like an appointment as soon as possible. 我希望能尽早预约一个时间。She earns twice as much as her husband. 她赚的钱比她丈夫多一倍。I haven't got as many books as you have. 我的书没有你那样多。
3 used for talking about sb/sth's job, role or function （用于指工作、身分或作用）: He works as a train driver. 他当火车司机。Think of me as your friend, not as your boss. 不要把我当作上司，把我视为朋友好了。You could use this white sheet as a tablecloth. 你可以用这条白床单当桌布。
4 in a particular way, state, etc; like 以某种方式或状态等: Please do as I tell you. 请照我的话做。Leave the room as it is. Don't move anything. 让房间保持原状。什么也别动。
5 used at the beginning of a comment about what you are saying （用于带出要说的话）: As you know, I've decided to leave at the end of the month. 大家都知道，我已经决定月底离开。
6 because 因为: I didn't buy the dress, as I decided it was too expensive. 我没有买那件衣服，因为我认为太贵了。
as for used when you are starting to talk about a different person or thing （用于改谈另一人或另一事物）:
Gianni's upstairs. As for Andreas, I've no idea where he is. 詹尼在楼上。至于安德烈亚斯，我不知道他在哪里。 as if;as though used for saying how sb/sth appears （用于描述样子）:
She looks as if/though she's just got out of bed. 她好像刚起床的样子。 as it were used for saying that sth is only true in a certain way （用于表示某事物只在某方面正确）:
She felt, as it were, a stranger in her own house. 她觉得，她在家中有些像个外人。 as of;as from starting from a particular time 自某时刻开始:
As from next week, Tim Shaw will be managing this department. 从下个星期开始，蒂姆˙肖将管理这个部门。 as to about a particular thing; concerning 关于某事物:
I was given no instructions as to how to begin. 对于如何开始，没有人给我指示。