| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [modal v] [vb infin] [vb pp] a | 2816 |
|
| 2 | [vb mod] [vb infin] [vb pp] a | 2816 |
|
| 3 | could [vb infin] [vb pp] [art] | 844 |
|
| 4 | could [vb infin] [verb] a | 457 |
|
| 5 | could [verb] [vb pp] a | 335 |
|
| 6 | could [vb infin] [vb pp] a | 335 |
|
