| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | could [vb infin] [pron] [prep] | 1806 |
|
| 2 | could [vb infin] [pron] [verb] | 1310 |
|
| 3 | [vb infin] [pron] [prep] [verb] | 1277 |
|
| 4 | could [vb infin] [prep] [verb] | 291 |
|
