it is necessary that the meeting begin at once.翻译并说明begin这个时

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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

egin 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

it is necessary that the meeting begin at once.翻译并说明begin这个时下面各句均有一处错误,请指出并改正!1、The meeting is begin at 2:00 and it will 19.It is necessary that the problem ( ) at once. It is necessary that the problem be settled at once. the meeting begin at2:00 and it is over at 4:30 这个句子哪里错了 "The headmaster announces\d that the sports meeting is begin Then at once,it is spring!The d___ begin to get longer.首字母填空 They__________--(begin)the meeting at 8 yesterday the meeting will begin at---------(选择题） it is the necessary to take the first step to begin the ( ) Let's begin at once,it's already late. _“The meeting is scheduled to begin at 7 o'clock."