Ask him again, and he will tell you.

If you ask him again, he will tell you.

这个句子答案填and，相当于一个条件句If you ask him again, he will tell you.

and前后两个句子是顺承关系还是条件关系？这个题该怎么解析呢？

解析如下：

祈使句（表条件）+ and +主句（表结果）

(1)祈使句（表条件）+ or else/or/otherwise + 主句（表结果）…… “否则……，要不然……”

Hurry up, or you’ll be late for class.

=If you don't hurry up, you will be late.

如果你不快点，你会迟到的。

Please call me up before you come, otherwise/or else/or we might be out.

你来之前打个电话，否则，我们也许会出去。

(2)祈使句（表条件）+ and +主句（表结果）

Think it over and you will find the answer.

=If you think it over, you will find the answer.

好好想想 ,你会有答案的。

Give him an inch and he will take a mile.

得寸进尺。

Work hard and you will make progress every day.

好好学习，天天向上。

一、祈使句 + and + 句子：祈使句表示条件含义，and 后面的句子表示“相向的结果”。

1. Work hard and you will be successful.

努力工作，你就会成功。

2. Forgive others, and you will be forgiven.

如果宽恕别人，你就会被宽恕。

3. Stop by me and you will be safe.

挨近我，你会安全的。

二、祈使句 + otherwise + 句子：祈使句表示条件意义，otherwise 后面的句子表示“相反的结果”。

1. Seize the chance, otherwise you'll regret it.

抓住这个机会，否则你会后悔的。

2. Do as you're told, otherwise you'll be in trouble.

叫你怎么做就怎么做，否则有麻烦。

3. Be modest, otherwise you will lag behind.

要谦虚，否则就要落后。

    “祈使句 + and ...”结构，前面的祈使句相当于条件句。例如：Work hard, and you will succeed . (= If you work hard, you will succeed . ) 努力工作，你会成功的。（摘自《薄冰英语惯用法词典》）

    Ask him again, and he will tell you. (= If you ask him again , he will tell you.)再问问他，他会告诉你的。