| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [was/were] [verb] three years | 36 |
|
| 2 | [was/were] [vb pp] three year | 32 |
|
| 3 | was [verb] three year | 29 |
|
| 4 | were [verb] three year | 7 |
|
