| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [prep] who could [vb infin] | 16 |
|
| 2 | of [Wh pn] could [vb infin] | 14 |
|
| 3 | [prep] whom could [vb infin] | 10 |
|
| 4 | [prep] [Wh pn] could have | 7 |
|
