| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [pers pn] could [vb infin] | 39978 |
|
| 2 | could [not/n't] [vb infin] | 21338 |
|
| 3 | [pers pn] could [not/n't] | 16982 |
|
| 4 | [pers pn] [not/n't] [vb infin] | 1049 |
|
