1.作为连接词,连接两个相似或对比的事物,表达“像……一样”或“和……一样”的意思。
例句:
He sings as well as his sister.
(他唱歌和他妹妹一样好。)
As the weather gets colder, people start wearing coats.
(随着天气变冷,人们开始穿外套。)
2. 表示身份、职位、能力等,通常放在句首。
例句:
As a teacher, he is very patient with his students.
(作为一名教师,他对学生很有耐心。)
As a mother, she always puts her children first.
(作为一名母亲,她总是把孩子放在第一位。)
3. 表示程度、方式、时间等,在句子中作状语。
例句:
She runs as fast as she can.
(她尽可能地跑得快。)
He finished his homework as soon as possible.
(他尽快完成了作业。)
4. 表示原因或结果,在句子中通常放在句首。
例句:
As a result of the bad weather, the school was closed.
(由于天气不好,学校关闭了。)
As he was feeling sick, he stayed home.(因为他感觉不舒服,他呆在家里了。)

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