| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | could [adv] [vb infin] whether [art] | 15 |
|
| 2 | could [adv] [vb infin] whether [art] | 15 |
|
| 3 | could not [vb infin] whether [art] | 13 |
|
| 4 | could [adv] [vb infin] whether the | 13 |
|
| 5 | could [not/n't] [vb infin] whether [art] | 13 |
|
| 6 | could n't [vb infin] whether [art] | 8 |
|
| 7 | could [adv] tell whether [art] | 5 |
|
| 8 | could not [vb infin] whether [art] | 5 |
|
