| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [vb infin] [modal v] [vb infin] | 339 |
|
| 2 | could [vb infin] [vb infin] | 118 |
|
| 3 | could [vb infin] [modal v] | 79 |
|
| 4 | could [modal v] [vb infin] | 14 |
|
