 
  
 ˈcrack-up 名词 俗
I. crack up 动词 不及物动词 俗
II. crack up 动词 trans
1. crack up (assert):
 
  
 | I | crack up | 
|---|---|
| you | crack up | 
| he/she/it | cracks up | 
| we | crack up | 
| you | crack up | 
| they | crack up | 
| I | cracked up | 
|---|---|
| you | cracked up | 
| he/she/it | cracked up | 
| we | cracked up | 
| you | cracked up | 
| they | cracked up | 
| I | have | cracked up | 
|---|---|---|
| you | have | cracked up | 
| he/she/it | has | cracked up | 
| we | have | cracked up | 
| you | have | cracked up | 
| they | have | cracked up | 
| I | had | cracked up | 
|---|---|---|
| you | had | cracked up | 
| he/she/it | had | cracked up | 
| we | had | cracked up | 
| you | had | cracked up | 
| they | had | cracked up | 
