| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | could [vb infin] [prep] a | 1096 |
|
| 2 | they could [vb infin] [prep] | 582 |
|
| 3 | they could [vb infin] a | 233 |
|
| 4 | they [vb infin] [prep] a | 31 |
|
| 5 | they could [prep] a | 5 |
|
