| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [adv] for years | 255 |
|
| 2 | back for [noun] | 167 |
|
| 3 | [adv prt] for years | 110 |
|
| 4 | back for [noun pl] | 37 |
|
| 5 | back [prep] years | 10 |
|
| 6 | back [prep] years | 10 |
|
| 7 | back for year | 6 |
|
| 8 | back for years | 6 |
|
| 9 | back for years | 6 |
|
