按要求改写下列句子（2）：

（1）They never go back until 6 pm, do they?

考察的知识点：反义疑问句。当陈述部分含有以下这些含有否定意义的词：few, little, seldom, hardly, rarely, never, not, no, no one, nobody, nothing, none, neither等，疑问部分需用肯定结构。

（2）I had gone there, or I wouldn't be here now.

考察的知识点：

1. if引导的条件状语从句的同义句是：祈使句加and再加简单句。 and后面是一件比较积极的事情。如：

   Take a map with you, and you will find your way easily.
   带上地图，你将很容易找到路。
   Claw me and I'll claw thee.
   投之以桃，报之以李。

2. if引导的条件状语从句的同义句也是：祈使句加or加简单句。这里的or也可以用or else或otherwise来取代，表示否则的意思，即否定的条件。or后面是一件比较消极的事情。如：

   Work hard, or you won't pass the exam.
   努力学习，否则你就通不过考试了。
   Respect yourself, or no one will respect you.
   尊重你自己，不然没人会尊重你。

您好，
1）They never go back until 6 pm, (do they)?
反义疑问句的关键是：
陈述句 = 肯定的，疑问句 = 否定的
陈述句 = 否定的，疑问句 = 肯定的

2）If I had gone there, I wouldn't be here now.
去掉 if 需要倒装，属于省略条件句型：
Had I gone there, I wouldn't be here now.