| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | they could [verb] [adv] | 271 |
|
| 2 | they could [verb] a | 238 |
|
| 3 | they [verb] [adv] a | 192 |
|
| 4 | could [verb] [adv] a | 93 |
|
