| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | could not be [vb pp] [prep] | 805 |
|
| 2 | could be [vb pp] [prep] be | 166 |
|
| 3 | not be [vb pp] [prep] be | 124 |
|
| 4 | could not be [vb pp] be | 6 |
|
