| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [verb] back [prep] a | 987 |
|
| 2 | [verb] [prep] a time | 636 |
|
| 3 | [verb] back [prep] time | 113 |
|
| 4 | back [prep] a time | 17 |
|
