| Form | Conjugation | 
|---|---|
| Plain? | つばを吐く | 
| Past? | つばを吐いた | 
| Negative? | つばを吐かない | 
| Volitional? | つばを吐こう | 
| Imperative? | つばを吐け | 
| Polite imperative? | つばを吐きなさい | 
| 〜たい? | つばを吐きたい | 
| Conditional (〜えば)? | つばを吐けば | 
| Conditional (〜たら)? | つばを吐いたら | 
| Potential? | つばを吐ける | 
| Passive? | つばを吐かれる | 
| Causative? | つばを吐かせる | 
| Prohibitive? | つばを吐くな | 
| 〜ます? | つばを吐きます |