| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | could [vb infin] a [adj] | 1821 |
|
| 2 | [modal v] [vb infin] a [num ord] | 199 |
|
| 3 | could [vb infin] [art] [num ord] | 86 |
|
| 4 | could [verb] a [num ord] | 20 |
|
