| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | could not [be] [vb pp] | 2251 |
|
| 2 | not [be] [vb pp] [subord] | 1133 |
|
| 3 | could [be] [vb pp] [subord] | 678 |
|
| 4 | could not [be] [subord] | 6 |
|
