到底是have a problem in doing sth还是have problem in doing sth为什么problem不加s

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到底是have a problem in doing sth还是have problem in doing sth为什么problem不加s

到底是have a problem in doing sth还是have problem in doing sth为什么problem不加s
到底是have a problem in doing sth
还是have problem in doing sth
为什么problem不加s

到底是have a problem in doing sth还是have problem in doing sth为什么problem不加s
固定搭配,在做某事上有困难
problem是可数名词.当前面有定冠词a时,其用原型;当其前没有定冠词时,才加s.

1.have a problem in doing sth 是个固定搭配,在做某事上有困难

固定搭配,英语中有很多固定搭配,语言这种东西很多时候是没有为什么的,是人们的习惯罢了。

have a problem in doing sth.