| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [verb] [prep] a [num] | 1937 |
|
| 2 | [verb] back [prep] a | 987 |
|
| 3 | [verb] back [prep] [num] | 626 |
|
| 4 | back [prep] a [num] | 28 |
|
| 5 | [verb] back a [num] | 20 |
|
