| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | back [prep] the last [noun] | 29 |
|
| 2 | back [prep] the last [noun sg] | 27 |
|
| 3 | back [prep] the last [adj] | 17 |
|
| 4 | back [prep] the last [num] | 11 |
|
| 5 | back [prep] the last century | 6 |
|
| 6 | back [prep] the last century | 6 |
|
| 7 | [verb] back [prep] the last | 37 |
|
| 8 | [v-ing] back [prep] the last | 13 |
|
| 9 | [vb past] back [prep] the last | 11 |
|
| 10 | look back [prep] the last | 10 |
|
| 11 | date back [prep] the last | 6 |
|
| 12 | [vb base] back [prep] the last | 5 |
|
