| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | could n't [vb infin] [prep] | 1113 |
|
| 2 | could n't [vb infin] [pn reflx] | 229 |
|
| 3 | n't [vb infin] [pn reflx] [prep] | 202 |
|
| 4 | could [vb infin] [pn reflx] [prep] | 177 |
|
