| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [indef pn] could [vb infin] | 2035 |
|
| 2 | [verb] [indef pn] [vb infin] | 1664 |
|
| 3 | [verb] could [vb infin] | 339 |
|
| 4 | [verb] [indef pn] could | 104 |
|
