| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [pron] could [adv] have | 1769 |
|
| 2 | [pers pn] could [adv] have | 1601 |
|
| 3 | it [modal v] [adv] have | 1369 |
|
| 4 | it could [adv] [verb] | 954 |
|
| 5 | it could [adv] [vb infin] | 950 |
|
| 6 | it could [adv] have | 242 |
|
| 7 | it could [adv] have | 242 |
|
