| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [prep] [v-ing] back [prep] an | 9 |
|
| 2 | [prep] [v-ing] back [prep] an | 9 |
|
| 3 | [be] [v-ing] back [prep] an | 6 |
|
| 4 | be [v-ing] back [prep] an | 6 |
|
| 5 | [v-ing] back [prep] an [adj] | 17 |
|
| 6 | [v-ing] back [prep] an [adj] | 15 |
|
| 7 | [v-ing] back [prep] an [noun] | 10 |
|
| 8 | [v-ing] back [prep] an [noun sg] | 9 |
|
