| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [Wh det] [modal v] be [vb pp] [prep] | 4412 |
|
| 2 | [Wh det] [modal v] be [vb pp] at | 180 |
|
| 3 | [modal v] be [vb pp] [prep] at | 116 |
|
