中间为什么有宾语就要用to do的形式呢?i'm sorry()so long,i forgot to tell you in advance where i had put my key. 这里有明显的现后关系吗?只因为forgot是用的过去式,所以要用完成时态吗?完成时态只能在谓语动作之前的动作才能用吗?难道就没有别的用法了吗?求详细讲解
allow后接doing动名词作宾语。但allow sb to do sth 当它后接人时后面用不定式作补。能说详细点吗?举例子什么的Our school don't allow smoking . Our school don't allow students to smoke.为什么会有这种用法?;i'm sorry()so long,i forgot to tell you in a...