| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | could be [vb pp] [prep] | 7113 |
|
| 2 | not be [vb pp] [prep] | 6596 |
|
| 3 | could not be [vb pp] | 2250 |
|
| 4 | could not be [prep] | 52 |
|
