| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | have served for [adj] year | 14 |
|
| 2 | [verb] served for [adj] years | 14 |
|
| 3 | [verb] served for [num] year | 12 |
|
| 4 | had served for [adj] year | 8 |
|
| 5 | [vb past] served for [adj] year | 8 |
|
