| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [modal v] as | 1294 |
|
| 2 | [vb mod] as | 1294 |
|
| 3 | could [conj] | 518 |
|
| 4 | could [subord] | 106 |
|
| 5 | could as | 15 |
|
| 6 | could as | 15 |
|
