| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | could [not/n't] [vb infin] [prep] | 2115 |
|
| 2 | [not/n't] [vb infin] [pn reflx] [prep] | 582 |
|
| 3 | could [not/n't] [vb infin] [pn reflx] | 449 |
|
| 4 | could [vb infin] [pn reflx] [prep] | 177 |
|
