| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | could [vb infin] [vb pp] [pron] | 1286 |
|
| 2 | could [vb infin] [pron] [det] | 468 |
|
| 3 | could [vb infin] [vb pp] [det] | 349 |
|
| 4 | [vb infin] [vb pp] [pron] [det] | 288 |
|
