| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | who could [verb] | 1259 |
|
| 2 | who could [vb infin] | 1251 |
|
| 3 | [pron] could write | 169 |
|
| 4 | who [modal v] write | 34 |
|
| 5 | who could write | 7 |
|
