| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [prep] several years | 731 |
|
| 2 | by several [noun] | 296 |
|
| 3 | by several [noun pl] | 233 |
|
| 4 | by [adj] years | 180 |
|
| 5 | by [det] years | 24 |
|
| 6 | by several years | 12 |
|
| 7 | by several year | 12 |
|
