| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | they could [adv] [vb infin] [pron] | 415 |
|
| 2 | could [adv] [vb infin] [subord] [pron] | 232 |
|
| 3 | they could [adv] [vb infin] [subord] | 26 |
|
| 4 | they could [vb infin] [subord] [pron] | 19 |
|
