| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [modal v] [prep] [be] | 5048 |
|
| 2 | often [prep] [be] | 76 |
|
| 3 | often [modal v] [be] | 12 |
|
| 4 | often [modal v] [prep] | 5 |
|
