Foundation
English
Tenses
Sentences
Tenses
Question
Convert the given statement into a yes/no question. Ensure that the meaning of the sentence remains unchanged as far as possible. 

They have filed a complaint recently. 
Have they filed a complaint recently?
Recently, will they file a complaint?
Should they file a complaint?
Have a complaint been filed by them recently?
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Solution
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'Yes/No' questions are those questions which start from helping verbs like was, are, were, is, etc. 
In such a case, the order is Verb + Subject + Object. In the given sentence, 'have' is the verb, 'they' is the subject and 'complaint' is the object. 
Thus, option C is the correct answer.