as點解,.......................................................

as=像;如同
as=Used to describe sb/sth appearing to be sb/sth else
or
as=作為;當作
as=Used to describe the fact that sb/sth has a particular job or function.
Sentences

1.They were all dressed sa clowns.
他們都打扮成小丑。
2.The bomb was disguised as a package.
炸彈偽裝成一個包裹。
3.She works as a courier.
她的職業是導遊。
4.Treat me as a friend.
要把我當作朋友。
5.You can use that glass as a vase.
你可以把那個玻璃杯當作花瓶用。

as 有兩種用法
一個用作：因為
She cannot attend this meeting as she is in Singapore on that day
她不能參加這個會議，因為她當時在新加坡
I cannot run as my leg was hurt
我不能跑因為我的腿受傷了
另一個用法是：一樣，不但...而且 (as well as)
Tim is wealthy as well as her.
Tim 跟她一樣富有
John is clever as well as Mark
John跟Mark一樣聰明

i like eat ban of chocolate as chocolate is sweet

as=because