| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | could [not/n't] [vb infin] a time when | 6 |
|
| 2 | could [not/n't] [vb infin] a time [Wh adv] | 6 |
|
| 3 | could [not/n't] [vb infin] a time when | 6 |
|
| 4 | could [not/n't] remember a time [adv] | 6 |
|
