请问下面3道题为什么要那样选 1.our teacher will return by the time school begins.为什么要选begins(will begin,began,is beginning,begins)2.our classes___begin__at 7:30 tomorrow morning.(begin,begins,is beginning,were beginning)3.the tr
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请问下面3道题为什么要那样选 1.our teacher will return by the time school begins.为什么要选begins(will begin,began,is beginning,begins)2.our classes___begin__at 7:30 tomorrow morning.(begin,begins,is beginning,were beginning)3.the tr
请问下面3道题为什么要那样选 1.our teacher will return by the time school begins.为什么要选begins
(will begin,began,is beginning,begins)
2.our classes___begin__at 7:30 tomorrow morning.(begin,begins,is beginning,were beginning)
3.the train_leaves__at five this afternoon.(leave,leaving,leaves,are leaving)
请问下面3道题为什么要那样选 1.our teacher will return by the time school begins.为什么要选begins(will begin,began,is beginning,begins)2.our classes___begin__at 7:30 tomorrow morning.(begin,begins,is beginning,were beginning)3.the tr
在英语语法中：当句子表示将来发生的事情的一种预测或是陈述时,时间状语用一般现在时表示.
虽然有tomorrow morning表示将来的时间,但是句子表达的是经常性的动作,现在如此,过去如此,将来也如此.
同第二题一样
by the time表示时间状语 ，后面跟从句
所以school是主语
后面的动词begin要加S