| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | they could [adv] | 2522 |
|
| 2 | they could [adv] | 882 |
|
| 3 | [pron] could perhaps | 111 |
|
| 4 | they [modal v] perhaps | 35 |
|
| 5 | they could perhaps | 10 |
|
