If two nouns are joined by preposition, the noun on either side singular and the verb is also singular.
Day by day is the correct sentence.
She wondered whether could it be true.
وہ حیران تھی کہ کیا یہ سچ ہو سکتا ہے۔
"Could" is often used in conditional clauses
such as " someone thought about the true condition" so "could "is best to make a meaningful sentence
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