| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [noun sg] [prep] the past six years | 14 |
|
| 2 | [noun] for the past six years | 11 |
|
| 3 | [noun] over the past six years | 10 |
|
| 4 | [noun pl] [prep] the past six years | 9 |
|
| 5 | [noun prp] [prep] the past six years | 5 |
|
| 6 | [noun] in the past six years | 5 |
|
