1.as作介詞， 表示 作為 一般后面只能接一個名詞

She work sas a doctor.

As a league member, I'll take the lead in everything.

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2.as作為關系代詞，最好放在開頭

Eg. The moon travels round the earth once every month?which is known to everybody.

As is known to everybody, the moon travels round the earth once every month.

It is known to everybody that the moon travels round the earth once every month.(主語從句)

As we have seen, the focus of medical care in our society has been shifting from curing disease to preventing disease-especially in terms of changing our many unhealthy behaviors, such as poor eating habits, smoking and failure to exercise.gt

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3.as作為連詞來構成 狀語從句

(1)時間狀語從句(當…的時候)

As the summer comes, the day becomes shorter and shorter.

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(2)原因狀語從句(表示顯而易見的原因)，和since在語法上保持一致。

As she was not feeling well, we all sold her to stay at home.

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(3)讓步狀語從句，although引導的句子可以轉換成as的用法。

Although she may fail…

Fail as she may

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Although the graph is simple.

Simple as the graph is.

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Although he is rich, he doesn't have any friends.

Rich as heis, he doesn't have any friends.

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(4)方式狀語從句(就像..一樣；正如..一樣)

Do as the instruction says.

He came aswe expected.

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(5)比較狀語從句

I'm as tall as you.

總結

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