| Form | Conjugation | 
|---|---|
| Plain? | 呟く | 
| Past? | 呟いた | 
| Negative? | 呟かない | 
| Volitional? | 呟こう | 
| Imperative? | 呟け | 
| Polite imperative? | 呟きなさい | 
| 〜たい? | 呟きたい | 
| Conditional (〜えば)? | 呟けば | 
| Conditional (〜たら)? | 呟いたら | 
| Potential? | 呟ける | 
| Passive? | 呟かれる | 
| Causative? | 呟かせる | 
| Prohibitive? | 呟くな | 
| 〜ます? | 呟きます |