| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [vb past] [prep] [n mass] | 2125 |
|
| 2 | often [vb past] [prep] | 367 |
|
| 3 | often [prep] [n mass] | 19 |
|
| 4 | often [vb past] [n mass] | 5 |
|
