| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [prep] three years | 1472 |
|
| 2 | [prep] three years | 1472 |
|
| 3 | past [adj] years | 35 |
|
| 4 | past three [noun] | 17 |
|
| 5 | past three [noun pl] | 13 |
|
| 6 | past three year | 5 |
|
| 7 | past three years | 5 |
|
