| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | could [not/n't] [vb infin] | 21338 |
|
| 2 | could they [vb infin] | 220 |
|
| 3 | they [not/n't] [vb infin] | 77 |
|
| 4 | could they [not/n't] | 13 |
|
