| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | could [vb infin] [prep] a | 1096 |
|
| 2 | could [vb infin] on [prep] | 141 |
|
| 3 | [vb infin] on [prep] a | 105 |
|
| 4 | could [vb infin] on a | 11 |
|
