| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | could [not/n't] [vb infin] | 21338 |
|
| 2 | they could [vb infin] | 4177 |
|
| 3 | they could [not/n't] | 1609 |
|
| 4 | they [not/n't] [vb infin] | 77 |
|
