用if改写以下句子1.Afteryouhavefinishedeatingyoucanleavethetable.2.Onehasstudiedhard,andthentheexamisnotdifficultforhim.我知道答案是什么,不是主将从现.请英语语发好的童鞋赐教,要说出答案,3Q为什

Question

用if改写以下句子
1.After you have finished eating you can leave the table.2.One has studied hard,and then the exam is not difficult for him.我知道答案是什么,不是主将从现.请英语语发好的童鞋赐教,要说出答案,3Q
为什么不是主将从现?

Answer 1

1.If you have finished eating you can leave the table.这是一个时间状语从句的复合句,根据句意可以改写为包含条件从句的复合句.
2.If one has studied hard,the exam is not difficult for him.这是一个表示因果的并列句,可以改写为条件从句.
在时间状语从句和条件从句中,为了强调从句谓语动词的影响,尤其是给人提出建议忠告时常用现在完成时代替一般现在时.如：When the bus has stopped ,you can get off .