| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [vb past] [pron] could [not/n't] | 720 |
|
| 2 | [pron] could [not/n't] find | 352 |
|
| 3 | [vb past] [pron] could find | 19 |
|
| 4 | [vb past] [pron] [not/n't] find | 6 |
|
