| Form | Conjugation | 
|---|---|
| Plain? | 積み上げる | 
| Past? | 積み上げた | 
| Negative? | 積み上げない | 
| Volitional? | 積み上げよう | 
| Imperative? | 積み上げろ | 
| Polite imperative? | 積み上げなさい | 
| 〜たい? | 積み上げたい | 
| Conditional (〜えば)? | 積み上げれば | 
| Conditional (〜たら)? | 積み上げたら | 
| Potential? | 積み上げれる | 
| Passive? | 積み上げられる | 
| Causative? | 積み上げさせる | 
| Prohibitive? | 積み上げるな | 
| 〜ます? | 積み上げます |