| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [Wh det] could [be] [verb] | 1085 |
|
| 2 | [Wh det] could [be] [vb pp] | 1072 |
|
| 3 | [pron] could [be] heard | 32 |
|
| 4 | [Wh det] [modal v] [be] heard | 17 |
|
| 5 | [Wh det] [vb mod] [be] heard | 17 |
|
| 6 | [Wh det] could [be] heard | 10 |
|
| 7 | [Wh det] could [be] heard | 10 |
|
| 8 | [Wh det] could [be] hear | 10 |
|
