| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | to [noun] [prep] three years | 13 |
|
| 2 | to [noun] [prep] three years | 13 |
|
| 3 | to [noun] for three years | 8 |
|
| 4 | to [noun prp] [prep] three years | 6 |
|
