"Reserve"是一个动词和名词，其词性变化如下：
动词：
基本形式：reserve
现在分词：reserving
过去式：reserved
过去分词：reserved
名词：
可数名词单数形式：reserve
可数名词复数形式：reserves
不可数名词形式：reserve
在句子中，"reserve"作为动词表示“保留、预订、储备”，例如：
I want to reserve a table for two at the restaurant tonight.
The hotel reserves the right to cancel the reservation if the payment is not made on time.
作为名词，"reserve"表示“储备、储藏、保护区”，例如：
The company has a reserve of cash to use in case of emergency.
The national park has a large wildlife reserve to protect endangered species.
"Reserves"作为可数名词复数形式，表示“储备、备用品、储量”，例如：
The company has enough reserves of raw materials to last for several months.
The army keeps a large reserve of ammunition in case of war.
作为不可数名词，"reserve"表示“自然保护区、储备资金、预留额度”，例如：
The government has set up a new marine reserve to protect coral reefs and other sea creatures.
The bank has a reserve of funds to cover unexpected losses.
