| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [modal v] [vb infin] [adv] [pron] | 770 |
|
| 2 | could [vb infin] [adv] [pron] | 372 |
|
| 3 | could [verb] [adv] [pron] | 97 |
|
