| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | could [vb infin] [pron] [verb] | 1310 |
|
| 2 | [modal v] [vb infin] [pron] know | 277 |
|
| 3 | could [vb infin] [pron] [vb infin] | 206 |
|
| 4 | could [vb infin] [pron] know | 53 |
|
| 5 | could [verb] [pron] know | 42 |
|
