| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | could [vb infin] [prep] a [noun] | 747 |
|
| 2 | [vb infin] on [prep] a [noun] | 64 |
|
| 3 | could [vb infin] on [prep] [noun] | 41 |
|
| 4 | could [vb infin] on [prep] a | 17 |
|
| 5 | could [vb infin] on a [noun] | 7 |
|
