| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [pers pn] could [vb infin] [vb pp] | 2966 |
|
| 2 | [pers pn] could [vb infin] a | 2363 |
|
| 3 | could [vb infin] [vb pp] a | 290 |
|
| 4 | [pers pn] [vb infin] [vb pp] a | 73 |
|
