| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | could [vb infin] [prep] a | 1096 |
|
| 2 | could [vb infin] [prep] [adv] | 255 |
|
| 3 | [vb infin] [prep] [adv] a | 155 |
|
| 4 | could [vb infin] [adv] a | 93 |
|
