I. sign [saın] 名词
II. sign [saın] 动词 trans
| I | sign |
|---|---|
| you | sign |
| he/she/it | signs |
| we | sign |
| you | sign |
| they | sign |
| I | signed |
|---|---|
| you | signed |
| he/she/it | signed |
| we | signed |
| you | signed |
| they | signed |
| I | have | signed |
|---|---|---|
| you | have | signed |
| he/she/it | has | signed |
| we | have | signed |
| you | have | signed |
| they | have | signed |
| I | had | signed |
|---|---|---|
| you | had | signed |
| he/she/it | had | signed |
| we | had | signed |
| you | had | signed |
| they | had | signed |