| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [pron] could [vb infin] [prep] a | 575 |
|
| 2 | [pron] they could [vb infin] [prep] | 99 |
|
| 3 | they could [vb infin] [prep] a | 48 |
|
| 4 | [pron] they could [vb infin] a | 6 |
|
