it is morning ( )we have four classes,not afternoon 填which还是when,为什么如上
问题描述：
it is morning ( )we have four classes,not afternoon 填which还是when,为什么
如上
答
填 that
这是it is .......that........的强调结构
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答
when
定语从句，when代替先行词morning在从句中做状语，when =in which
翻译为：我们是在上午有四节课，不是下午。
答
句子有问题
应该是 it is in the morning (that )we have four classes,not in the afternoon .
我们是在上午上四节课 而不是在下午
这是强调句型 对时间状语 强调
答
强调句，要用that。
答
when
相当于in which
这句话倒过来就是we have four classes in the morning,not afternoon.