| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | could not [vb infin] [pron] [verb] | 187 |
|
| 2 | not [vb infin] whether [pron] [verb] | 42 |
|
| 3 | could not [vb infin] whether [pron] | 27 |
|
