| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | they could [verb] | 4234 |
|
| 2 | [pron] could do | 2806 |
|
| 3 | [pers pn] could do | 2677 |
|
| 4 | they [modal v] do | 1525 |
|
| 5 | they could do | 294 |
|
