| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | could [vb infin] [been] [vb pp] for | 59 |
|
| 2 | [vb infin] [been] [vb pp] for [art] | 58 |
|
| 3 | could [vb infin] [vb pp] for [art] | 20 |
|
| 4 | could [vb infin] [been] [vb pp] [art] | 9 |
|
