小學國語課文 章法 因果 映襯 時間 結構 論敘法 凡目法 正反法 賓主法 今昔法 時間虛實法 Organization of writing Structure Text of mandarin for elementary school Cause and effect Reflection Time arrangement Descriptive method The method to present correlation between the general and the specific The positive and the negative Nominative and predicate Now and past The correlation between reality and fantasy in respect of time arrangement