| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [prep] a [det] years | 581 |
|
| 2 | [vb past] [prep] a [det] | 300 |
|
| 3 | [vb past] [prep] [det] years | 119 |
|
| 4 | [vb past] a [det] years | 63 |
|
