My hair isaslong as yours.我的頭髮和你的一樣長。

Asstudents, we should obey the school regulations.作為學生，我們應該遵守學校規章。

Asyou can see, nobody can break the law.正如你所見，沒人能違反法律。

The total weight of these bronzeasses is 500 grams.這些青銅硬幣的總重量為500克。

I meant itasa joke.這話我只是當作玩笑講的

as引導的定語從句脩飾表人或物的先行詞，即先行詞可以是人也可以是物;在定語從句中可以做主語、賓語或表語;常用The same as / such…as/ as(so)…as句型，as不論在定語從句中作何成分，均不能省略。eg:such teachers as know Tom think him bright.

知道Tom的老師都認為他很聰明（先行詞為人 such teachers，as作know的主語）

(2）I'll buy the same bike as I lost yesterday.

先行詞為物 the same bike，as作lost的賓語，指同一類事物

She wore the same dress as her young sister wore.( the same.as…泛指同類）

她穿著和她妺妺所穿的一樣的裙子。

That is the same watch as l lost.

那塊手錶和我丟失的一模一樣。( the same.as.泛指同一類)

It's so heavy a box as no one can lift.

as作lift的賓語