| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | could n't [vb infin] [art] | 1443 |
|
| 2 | n't [vb infin] whether [art] | 66 |
|
| 3 | could n't [vb infin] whether | 44 |
|
| 4 | could [vb infin] whether [art] | 15 |
|
