但係將漢字睇成助字定係虛字又唔係一成不變，而係會因年代、訓讀嘅人而唔同。譬如表示「喺」嘅「於、於」一般睇成虛字，但係舊時亦都有睇成助字而讀「 」嘅。
However, whether Chinese characters are regarded as auxiliary characters or imaginary characters is not static, but will vary depending on the era and the person who reads it. For example, the word "in" is generally regarded as imaginary characters, but in the past, it was also read as an auxiliary word.