'The' is optional in the last instance but should not be used in the first instance: To form simple past questions , we need the auxiliary verb 'did' and the principal verb in (the) dictionary or infinitive form. The term 'simple form' is not right here, since 'eats' is also the simple form of 'eat'.
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Mister MicawberBut not 'present form', which can include '-s' form.Ok Mister Micawber. Thank you for your explanation, but I'm not using 'present form' I'm using 'simple form' which if I'm not mistaken is the same as 'base form' of the verb, isn't it?