| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [verb] [pron] could do | 312 |
|
| 2 | [vb past] [verb] [pron] do | 269 |
|
| 3 | [vb past] [verb] [pron] could | 151 |
|
| 4 | [vb past] [pron] could do | 119 |
|
