| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [modal v] [conj] should | 264 |
|
| 2 | could [conj] [modal v] | 157 |
|
| 3 | could [conj] [vb mod] | 157 |
|
| 4 | could [conj] should | 92 |
|
