Convert the sentence 'मोहन पढ़ता है' (Mohan studies) into the doubtful past tense (संदिग्ध भूतकाल) -

The doubtful past tense (संदिग्ध भूतकाल) expresses uncertainty about whether an action was completed in the past. It is formed by adding 'होगा/होगी/होंगे' to the past participle. Thus, 'मोहन ने पढ़ा होगा' is the correct form.