| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | could have [verb] better | 21 |
|
| 2 | could [vb infin] [vb pp] better | 20 |
|
| 3 | could [vb infin] do better | 15 |
|
| 4 | could [vb infin] done better | 15 |
|
