| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [prep] 1990 when [pers pn] | 14 |
|
| 2 | [prep] 1990 when [pers pn] | 14 |
|
| 3 | in 1990 when [pers pn] | 9 |
|
| 4 | in 1990 when [pers pn] | 9 |
|
| 5 | [prep] 1990 when he | 7 |
|
