| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | be [v-ing] back [prep] a | 29 |
|
| 2 | was [v-ing] back [prep] a | 14 |
|
| 3 | be [v-ing] back to a | 11 |
|
| 4 | be going back [prep] a | 9 |
|
| 5 | 're [v-ing] back [prep] a | 8 |
|
| 6 | be [v-ing] back from a | 7 |
|
| 7 | were [v-ing] back [prep] a | 6 |
|
| 8 | be [v-ing] back [prep] an | 6 |
|
| 9 | be [v-ing] back in a | 5 |
|
