| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | could not be [vb pp] to | 77 |
|
| 2 | could n't be [vb pp] to | 13 |
|
| 3 | could [not/n't] be attributed to | 7 |
|
| 4 | could [not/n't] be said to | 5 |
|
