| Subject | English | Japanese |
| obs. | prt indicates a question | や spec1 |
| gen. | prt indicates a question | か spec1 was written as 歟; used at sentence-end (sometimes rhetorical) |
| gen. | indicates a rhetorical question | て spec1 abbr. for と, というのは and other similar combinations |
| gen. | indicates a rhetorical question | って spec1 |
| abbr. | prt indicates question | と spec1 (sentence end) |
| gen. | exp indicates question | だろうか |
| gen. | exp indicates question | でしょうか |
| gen. | exp indicates question | ですか at sentence-end |
| gen. | indicates question | のん at sentence-end, falling tone |
| gen. | at sentence-end, rising tone indicates question | の spec1 occasionally ん, orig. written 乃 or 之 |