it is necessary that the meeting begin at once.翻译并说明begin这个时态怎么看,总句的时态怎么看谢谢
问题描述：
it is necessary that the meeting begin at once.翻译并说明begin这个时态怎么看,总句的时态怎么看谢谢
答
begin 不是时态的问题
本句句首的It作形式主语,真正的主语是that引导的从句,即:that the meeting begin at once .that引导的主语从句采用了虚拟语气,其完整的形式为It is necessary that the meeting （should）begin at once