| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | could [vb infin] [pron] [adv] | 1450 |
|
| 2 | could [vb infin] [pers pn] [adv] | 1219 |
|
| 3 | [modal v] [vb infin] us [adv] | 417 |
|
| 4 | could [vb infin] we [adv] | 35 |
|
| 5 | could [verb] us [adv] | 33 |
|
