| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [modal v] [adv] [vb infin] [verb] [det] | 552 |
|
| 2 | could [adv] [vb infin] [verb] [det] | 235 |
|
| 3 | could [adv] [vb infin] [verb] [adj] | 126 |
|
| 4 | could [adv] [verb] [verb] [det] | 71 |
|
