| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [prep] [pron] [modal v] [be] | 2928 |
|
| 2 | [prep] [Wh det] [modal v] [be] | 1491 |
|
| 3 | [prep] which [modal v] [be] | 571 |
|
