可以加的。
ask有没有后面接虚拟语气的用法.请举例ask用于虚拟语气是接should do。ask(that)sb.(should)do 要求某人应该做某事（虚拟语气）
that引导宾语从句，sb.是宾语从句的主语，把ask(that)sb.(should)do结构中的括号去掉，也可以说成是ask sb.do。例句：He asked that they(should)be allowed to use a dictionary.
他要求准许他们用词典。扩展资料
ask的用法
1、ask的基本含义是“问，询问”，指对不知道或不明白的事情、道理、情况提出问题请别人解答，或向别人打听、探询以便了解，所问之事与被询问者可能有关，也可能无关。ask还可作“请求，要求”解，指说明自己的请求和愿望，以获得所要的东西或所要达到的目的，有期望答复（特别是肯定的答复）的含义。ask还可引申表示“邀请”。2、ask用作及物动词，其后可接名词、代词、带或623039不带疑问词的动词不定式或that/wh-从句作宾语，that从句中常使用虚拟式。3、ask还可接以动词不定式充当补足语的复合宾语。ask也可接双宾语,这时两个宾语都是直接宾语，指物的直接宾语可由名词、代词、带疑问词的动词不定式或wh-从句充当。ask接两个宾语转换成被动结构时多以表示人的宾语作主语，且by可省略。此外还可接以副词或介词短语充当补足语的复合宾语。4、ask后可带直接宾语和间接宾语，如ask his name和ask him。也可带双宾语，但是要注意将间接宾语（指人的词）先放在前面，中间不需要任何介词连接。
ask后的宾语从句连词可以用很多哦·,要看具体意思
1)if和whether都可以
如：He asked if Mr.Gilbert 's operation had been successful.
他问吉尔伯特先生的手术中否成功.
He asked whether the man were a Chinese 他问那个男人是不是中国人
2）还有就是关系代词what,why,where,when,how,who等都可以.
如：He asked me what I did in my free time.
他问我业余时间做什么.
He asked me when he would see me again.
他问我什么时候他还能见到我.
3）that 也可以
如：He asked that he be given an opportunity to try.
他要求给他一个试试的机会.
这个要分情况
that引导宾语从句时不可省略的九种情况
一、在英式英语中动词add,agree,announce,argue,assume,complain,decide,hold,indicate,insist,intend,learn,promise,point out,remark,suggest,state等之后的宾语从句的引导词that需保留.例如：
I complained that I had been unfairly treated.
二、及物动词后跟有两个或两个以上的宾语从句时,最后一个从句的that不可省略.例如：
I realize that I’m in charge and that everybody accepts my leadership.
三、当动词后跟有复合宾语结构时,it作形式宾语,that从句作真正宾语,引导词that不可省略.例如：
We consider it an honor that we can have the pleasure of serving you.
四、当动词和that从句之间有插入语或者主句的状语时,that不可省略.例如：
The secretary said,pleasantly and sternly,that our thinking was too slow to suit the needs of modern society.
We learned at school that everything we see and touch is matter.
五、当that从句的状语紧跟在that之后时,that不可省略.例如：
They told us that once again the situation was serious.
试比较：They told us once again that the situation was serious.
六、当作宾语的that从句移到句首时,that不可省略.例如：
That she ever said such a thing I simply don’t believe.
七、在简短答语中当that从句单独出现时,that不可省略.例如：
�What did he say at the meeting?�That the situation was serious.
八、当that从句中含有一个状语从句,且这个状语从句在主句之前时,that不可省略.例如：
Mr Parker understands that unless he pays back the debt,he’ll have to appear in court.
九、当that从句用作in,but,except等介词的宾语时,that不可省略.例如：
The book is unsatisfactory in that it lacks a good index.
选A，因为if此处的意思为“是否”，你翻译一下即可。B选项if not后面不能加句子了，可以这样使用：Is it going to rain tomorrow?If not,I'll not go to the cinema.
C选项不可以，因为问的内容if you're speaking to a boy or a girl是一个问句，如果没有，就变成在问一个事实了。ask后面不能加that从句，因为that从句表示的是一个事实，而ask问，后面应该加以wh-开头的疑问词引导的从句。
选A,因为if此处的意思为“是否”,你翻译一下即可.B选项if not后面不能加句子了,可以这样使用：Is it going to rain tomorrow?If not,I'll not go to the cinema.C选项不可以,因为问的内容if you're speaking to a.
