此规律是指在时间或条件状语从句中,尤其主句为一般将来时的情况下,从句用一般现在时代替一般将来时,而主句还用通常的表示法.如下面的例句：
When he comes back,I wil tell him the news.
If you comes back,please call me.
We shall not go shopping if it snows this afternoon.
此规律是指在时间或条件状语从句中,尤其主句为一般将来时的情况下,从句用一般现在时代替一般将来时,而主句还用通常的表示法.如下面的例句：
When he comes back,I wil tell him the news.
If you comes back,please call me.
We shall not go shopping if it snows this afternoon.