| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | could [vb infin] [vb pp] [pers pn] | 871 |
|
| 2 | could [vb infin] [pers pn] all | 103 |
|
| 3 | [vb infin] [vb pp] [pers pn] all | 70 |
|
| 4 | could [vb infin] [vb pp] all | 22 |
|
