| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | could [not/n't] [vb infin] [art] | 2785 |
|
| 2 | [not/n't] [vb infin] whether [art] | 142 |
|
| 3 | could [not/n't] [vb infin] whether | 93 |
|
| 4 | could [vb infin] whether [art] | 15 |
|
