There are three other circumstances when do is used in affirmative sentences or clauses. It is used for contrastive emphasis when we want to contrast one set of circumstances or point in time with ...

So, adding KA to the sentence KORE WA OMIYAGE DESU (This is a souvenir) becomes KORE WA OMIYAGE DESU KA (Is this a souvenir?) Now, double-check an affirmative sentence and a question. KORE WA ...