| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [prep] three years [pers pn] | 48 |
|
| 2 | [prep] years [pers pn] [modal v] | 25 |
|
| 3 | three years [pers pn] [modal v] | 16 |
|
| 4 | [prep] three years [modal v] | 11 |
|
| 5 | [prep] three [pers pn] [modal v] | 6 |
|
