| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [verb] back [prep] the [adj] [num ord] | 17 |
|
| 2 | date back [prep] the [adj] [num ord] | 6 |
|
| 3 | [v-ing] back [prep] the [adj] [num ord] | 5 |
|
| 4 | back [prep] the [adj] [num ord] [noun] | 20 |
|
| 5 | back [prep] the [adj] [num ord] [noun sg] | 20 |
|
| 6 | back [prep] the [adj] [num ord] century | 15 |
|
| 7 | back [prep] the [adj] [num ord] century | 15 |
|
