| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | had work for many year | 6 |
|
| 2 | [vb past] work for many year | 6 |
|
| 3 | [vb past] worked for many year | 6 |
|
| 4 | [vb past] work for many years | 6 |
|
