| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | they could [not/n't] [vb infin] [pron] at | 6 |
|
| 2 | they could not [vb infin] [pron] at | 6 |
|
| 3 | they could [adv] [vb infin] [pron] at | 6 |
|
