Passive Voice

應該係：Spending on libraries was reduced by the Urban Council。
點解？passive voice 結構，其實只係原句主要動詞（即講係乜野動作o個個，如 walk，dance）之前，多左個 be 或佢o既不同變化，即係：be, is, am, are, was, were, been, being
例子：
John kicked him. => He was kicked by John.
只要主要動詞前加上 be，將主要動詞本來o既形態（呢句係 past tense）套用於 be 度（咁 be 就變成 was），再將主要動詞變成 past participle，同埋 subject object 換位，咁就成句變成 passive。多個例子，留意動詞 tense 變化：
The dog is barking at Simon. => Simon is being barked at (by the dog).（is 不變，只係加左 be，佢繼承左 barking o既 ing，而 barking 則變成過去分詞 barked）
睇返你o個句，be 加於 reduced 之前，變成 was，但 reduce 變成過去分詞，都係 reduced，所以係 was reduced。spending [on libraries] 係 gerund，係全句o既 object，所以冇野轉。因此就得出答案o個句。

The Urban Council reduced spending on libraries.
Passive Voice:
The spending on libraries was reduced by the Urban Council.

passive voice:
Spending on libraries was reduced by the Urban Council.



2008-06-13 16:51:01 補充：
大區君: I agree with hkwaddle君, passive voice 若正確, 是可以一字不變轉回 active voice 之句子, 但你加咗個 the 字響 spending on libraries 之前, 一轉回 active voice 會同原句有出入

The libraries spending was reduced by the Urban Council.