| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [prep] ten years | 782 |
|
| 2 | [vb past] [prep] ten | 120 |
|
| 3 | [vb past] ten years | 75 |
|
| 4 | [vb past] [prep] years | 56 |
|
