| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | could [vb infin] [been] [vb pp] | 1056 |
|
| 2 | [vb infin] [been] [vb pp] from | 166 |
|
| 3 | could [vb infin] [vb pp] from | 76 |
|
| 4 | could [vb infin] [been] from | 5 |
|
