| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [prep] [adv] a year | 355 |
|
| 2 | be [prep] [adv] a | 313 |
|
| 3 | be [adv] a year | 140 |
|
| 4 | be [prep] a year | 9 |
|
