| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | back [prep] [noun] or [verb] | 9 |
|
| 2 | back [prep] [noun sg] or [verb] | 8 |
|
| 3 | back to [noun] or [verb] | 8 |
|
| 4 | back [prep] work or [verb] | 7 |
|
| 5 | back [prep] work or [verb] | 7 |
|
| 6 | back [prep] [noun] or [vb base] | 5 |
|
