| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [prep] they could [vb infin] | 105 |
|
| 2 | what they could [vb infin] | 76 |
|
| 3 | [prep] what could [vb infin] | 60 |
|
| 4 | [prep] what they could | 30 |
|
