| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [adv prt] [prep] three years | 67 |
|
| 2 | [adv prt] [prep] three years | 67 |
|
| 3 | up [prep] three years | 51 |
|
| 4 | [adv prt] to three years | 48 |
|
| 5 | [adv prt] to three years | 48 |
|
| 6 | [adv prt] for three years | 10 |
|
| 7 | [adv prt] for three years | 10 |
|
| 8 | out [prep] three years | 7 |
|
