1 used in time clauses
If something happens as something else happens, it happens while the other thing is happening.
如果某件事发生在其他事情发生的同时，则它在另一件事发生的同时发生。（即：可以被翻译为“当”或“随着”）
- She wept bitterly as she told her story.
- The play started as I got there.
You also use as to say that something is done whenever something happens.
您也可以用as来说 - 每当某件事情发生时，其他的某件事情就会被完成。即：可以被翻译为“当”或“随着”）
- Parts are replaced as they grow old. 每当零件变旧，它们就会被替换
Note that you do not use 'as' simply to mean 'at the time that'. For example, you do not say 'As I started work here, the pay was ￡2 an hour'. You say 'When I started work here, the pay was ￡2 an hour'.
2 used to mean 'because'
As is often used to mean 'because' or 'since'.
- She bought herself an iron as she felt she couldn't keep borrowing Anne's.
- As he had been up since 4 a.m. he was no doubt now very tired.
3 used with adjectives
You can use as in front of an adjective to say how someone or something is regarded or described.
您可以在形容词前使用as来表示，某人或某物被如何看待或描述。即：和...一样的
- He regarded them as snobbish.
- Hey regarded manual work as degrading.
- Officials described him as brilliant.
WARNING: You do not use 'as' after comparative adjectives. You do not say, for example, 'The trees are taller as the church'. You say 'The trees are taller than the church'.
- She was much older than me.
4 used in prepositional phrase
You can also use as in prepositional phrases to say how someone or something is regarded, described, treated, or used.
您还可以在介词短语中使用as来表示如何看待，描述，对待或使用某人或某物。
- He was regarded as something of a troublemaker.
- If Pluto had been discovered today, it would never be classified as a planet.
- I treated business as a game.
- I wanted to use him as an agent.
You can also use as in prepositional phrases to say what role or function someone or something has.
您还可以在介词短语中使用as来表达某人或某物的角色或功能。可译为：作为...的角色或功能
- He worked as a clerk.
- He served as Kennedy's ambassador to India.
- Bleach removes color and acts as an antiseptic and deodorizer. 漂白剂可去除颜色，并用作防腐剂和除臭剂。
5 used in comparisons
In writing, as is sometimes used to compare one action to another.
在写作中，as有时用来将一个动作与另一个动作进行比较。
- He looked over his shoulder as Jack had done.
- She pushed him, as she had pushed her son.
Like and the way are used in a similar way.
Like和the way以类似方式使用。
You can also use as in front of some prepositional phrases, especially at the beginning of a sentence. For example, instead of saying 'She took a holiday in April, as he had done in previous years', you can say 'As in previous years, she took a holiday in April'.
您还可以在某些介词短语前面使用as，尤其是在句子的开头。
- As in previous attacks there was no warning of the bomb.
When you have just made a statement, you can use as as a conjunction to indicate that the statement also applies to another person, thing, or group. After as you use be, have, an auxiliary, or a modal, then the subject.
当您刚刚发表了一个声明, 您可以将as用作连词，以表明该声明也适用于其他人，事物或群体。 在as后，你使用助动词或情态动词，然后是主语。
- Our daughter feels that way, as do our sons.
WARNING: You do not usually use 'as' in front of a noun group when you are comparing one thing or person to another. You do not say, for example, 'She sang as a bird'. You say 'She sang like a bird'.
- He swam like a fish.
- I am a worker like him.
- Children, like animals, are noisy at meal times.
However, you can make a comparison using as, an adjective or adverb, and another as. For example, you can say 'You are just as bad as your sister'.
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