| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | back in [num] [adv] [pers pn] | 9 |
|
| 2 | back in [num] when [pers pn] | 9 |
|
| 3 | back in [num] when [pers pn] | 9 |
|
| 4 | back in [num] [Wh adv] [pers pn] | 9 |
|
| 5 | back in [num] [conj] [pers pn] | 7 |
|
