| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | could [vb infin] at [adj] time | 29 |
|
| 2 | could [vb infin] at [det] time | 29 |
|
| 3 | could [vb infin] at any time | 22 |
|
| 4 | could [vb infin] at any time | 22 |
|
