| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [pron] could [verb] [prep] a | 648 |
|
| 2 | they [vb mod] [verb] [prep] a | 387 |
|
| 3 | they [modal v] [verb] [prep] a | 387 |
|
| 4 | they could [verb] [prep] [art] | 205 |
|
| 5 | they could [verb] [prep] a | 59 |
|
