Taiwan is in the east of China but is off the mainland.
介词between用来说明“在……两者之间”或“三个以上人物或事物中的两者之间的相互关系”；among用来说明“在……两者以上之间”的相互关系；amid（amidst）和among都可
以用来表示没有确定数目的物体之间的相互关系，amid多用于正式文体。
There is a small river between the two villages.
The book is the best among these modern novels.
介词about， （all） over， （all） through， throughout都可以表示“在……范围内到处”，“遍布”的意义。
After meal I wandered alone about the town.
介词in front of和behind指前、后的相对位置。
She always looks in front of and behind the car before she starts it.
介词round， pass指“绕过”；其中pass指“从……旁边经过”；through指“从……之中穿过“。
The movie theater is round the corner.
He lives in the village past the bus stop through the park.
3.表示原因的介词
for常常表示褒贬、奖惩的原因或心理原因。
They will reward you for your help.
due to常常用来引导形容词性的短语，作定语或表语。
Mistakes due to carelessness may have serious consequences.
from和out of常常表示动机或原因；through表示消极或间接的原因。
He feels weak from lack of sleep.
He broke down through overwork.
4.表示目的的介词
for表示拟定的接收人或目的；to表示实际的接收人或目的。
I bought the gift for my little sister.
I gave the gift to my little sister.
for和to都可以引导目的地。For跟在含有出发或开始意义的动词后，如：leave， set out，start， depart， sail等；to跟在含有来来往往地行动的意义的动词后，如：go， come， run ，walk，move， fly， drive， ride等。
We have left for Hong Kong.
He flew to America via Hong Kong.
at表示起因；on表示依据。
She is quite pleased at his help.
Ken was arrested on a charge of that.
at还可引导行为的目标或精力的集中点。