| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [Wh det] [be] [to-vb] a | 82 |
|
| 2 | [Wh det] [be] [to-vb] been | 26 |
|
| 3 | [be] [to-vb] been a | 13 |
|
