| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [pron] [vb mod] [verb] three year | 7 |
|
| 2 | [pron] [modal v] [verb] three years | 7 |
|
| 3 | [pron] [modal v] [vb infin] three year | 7 |
|
| 4 | [pron] [modal v] [verb] three year | 7 |
|
