 
  
 lead up 动词 不及物动词
1. lead up (slowly introduce):
2. lead up (precede):
 
  
 | I | lead up | 
|---|---|
| you | lead up | 
| he/she/it | leads up | 
| we | lead up | 
| you | lead up | 
| they | lead up | 
| I | led up | 
|---|---|
| you | led up | 
| he/she/it | led up | 
| we | led up | 
| you | led up | 
| they | led up | 
| I | have | led up | 
|---|---|---|
| you | have | led up | 
| he/she/it | has | led up | 
| we | have | led up | 
| you | have | led up | 
| they | have | led up | 
| I | had | led up | 
|---|---|---|
| you | had | led up | 
| he/she/it | had | led up | 
| we | had | led up | 
| you | had | led up | 
| they | had | led up | 
