| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [modal v] [vb infin] [indef pn] [adv] [verb] | 66 |
|
| 2 | could [vb infin] [pron] [adv] [verb] | 63 |
|
| 3 | could [verb] [indef pn] [adv] [verb] | 10 |
|
