http://www.pons.de/produkte/3-12-517841-X/(牛津大学出版社授权产品)
 
  
 在《PONS词典》中的词汇
| I | step up | 
|---|---|
| you | step up | 
| he/she/it | steps up | 
| we | step up | 
| you | step up | 
| they | step up | 
| I | stepped up | 
|---|---|
| you | stepped up | 
| he/she/it | stepped up | 
| we | stepped up | 
| you | stepped up | 
| they | stepped up | 
| I | have | stepped up | 
|---|---|---|
| you | have | stepped up | 
| he/she/it | has | stepped up | 
| we | have | stepped up | 
| you | have | stepped up | 
| they | have | stepped up | 
| I | had | stepped up | 
|---|---|---|
| you | had | stepped up | 
| he/she/it | had | stepped up | 
| we | had | stepped up | 
| you | had | stepped up | 
| they | had | stepped up | 
 
  
 