| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | could [vb infin] for a | 102 |
|
| 2 | could [vb infin] on for | 36 |
|
| 3 | [vb infin] on for a | 30 |
|
| 4 | could [vb infin] on a | 11 |
|
