| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | they could [adv] [vb infin] | 1883 |
|
| 2 | they could [adv] [vb infin] | 600 |
|
| 3 | [pron] could still [vb infin] | 374 |
|
| 4 | they [modal v] still [vb infin] | 205 |
|
| 5 | they could still [verb] | 38 |
|
| 6 | they could still [vb infin] | 38 |
|
