有谁能帮我分析一下这句话的语法?

The general would not accept that defeat was a possibility.

首先说，这个句子不是虚拟语气，只是一个宾语从句，分析如下：

第一步：整个句子是一个包含了宾语从句的复合句。
The general would not accept that defeat was a possibility.
主句 引导词 从句
第二步：主句的主语是“将军 The general”谓语是“不能接受 would not accept”；从句是主系表结构，意思为：“失败的可能”“失败是一个可能”，
主句和从句之间用了一个没有意义的只起连接作用的连词that。

第三步：这个句子完全符合宾语从句的时态一致原则，主句从句都是过去时。
宾语从句的虚拟语气简单说有两种，“I wish...” 和“主语+ insist/ suggest/ propose等表建议命令的特殊动词+that宾语从句”，虚拟往往体现在that引导的从句的谓语动词部分。给几个例句：

I wish it would rain tomorrow. He wished he hadn't said that.
I suggest that we (should) hold a meeting next week.
He insisted that he (should ) be sent there.

The general 主语
would not accept 谓语
that 宾语从句引导词
defeat was a possibility宾语从句

你说的would有两种可能，1，一般现在时，一种猜测或可能‘2，过去时里的将来时