The form of "Nichigainai", which has conjecture with a high probability of being correct, not only encloses the previous sentence, but also has a strong fixedness of meaning based on "A wa B da". There are three kinds of thinking processes or operatio...
The form of "Nichigainai", which has conjecture with a high probability of being correct, not only encloses the previous sentence, but also has a strong fixedness of meaning based on "A wa B da". There are three kinds of thinking processes or operations with "Nichigainai" in some sentences(basic sentence patterns 2 - 5) which express situations :1 first, a simple conjecture without any clues or prepositions, second, a deductive conjecture to reach a certainty from some prepositions, and third, an inductive conjecture to come to a certainty from some clues or evidences.
If the second and the third conjectures are reasonings to get to certainties, the first one can be said to be a conclusive remark on the future rather than a simple conjecture.