| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | could [vb infin] [conj] [art] | 443 |
|
| 2 | could [vb infin] [adv prt] [art] | 443 |
|
| 3 | could [vb infin] [adv prt] [conj] | 344 |
|
| 4 | [vb infin] [adv prt] [conj] [art] | 267 |
|
