| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | could [vb infin] [vb pp] | 5483 |
|
| 2 | could [vb infin] [adv prt] | 3348 |
|
| 3 | [vb infin] [vb pp] [adv prt] | 2400 |
|
