| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | could [vb infin] on [prep] a | 15 |
|
| 2 | could [vb infin] on [prep] a | 15 |
|
| 3 | could go on [prep] a | 8 |
|
| 4 | could [vb infin] on for a | 6 |
|
| 5 | could [vb infin] on for a | 6 |
|
