| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | be [v-ing] [prep] | 7202 |
|
| 2 | [v-ing] back [prep] | 3877 |
|
| 3 | be back [prep] | 870 |
|
| 4 | be [v-ing] back | 243 |
|
