| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | back [prep] the [adj] century | 140 |
|
| 2 | back [prep] the last [noun] | 29 |
|
| 3 | [adv] [prep] the last century | 27 |
|
| 4 | [adv prt] [prep] the last century | 9 |
|
| 5 | back [prep] [art] last century | 6 |
|
| 6 | back [prep] the last century | 6 |
|
| 7 | back [prep] the last century | 6 |
|
| 8 | back [prep] the last century | 6 |
|
| 9 | back [prep] [art] last century | 6 |
|
