| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [vb mod] [pron] [verb] a | 1939 |
|
| 2 | [modal v] [pron] [verb] a | 1939 |
|
| 3 | could [pron] [verb] [art] | 472 |
|
| 4 | could [pron] [verb] a | 238 |
|
