| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | could not [verb] | 8977 |
|
| 2 | could not [vb infin] | 8968 |
|
| 3 | could [verb] [vb infin] | 120 |
|
| 4 | not [verb] [vb infin] | 101 |
|
