including 點解 + ing ?

因為一句話有兩個動詞.
provide 在 include 之前
所以 include 要 + ing

如果分兩句寫就唔洗喇
for example:
We request you can provide all drinks. Drinks should include beer.

include=包括(v)
including=包括(preposition)
圖片參考：http://hk.yimg.com/i/icon/16/5.gif