| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | could at [det] time | 9 |
|
| 2 | could at [det] time | 9 |
|
| 3 | could [prep] [det] time | 9 |
|
| 4 | could [prep] [det] time | 9 |
|
| 5 | could [prep] any time | 6 |
|
