| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | could [vb infin] [adv] [adv] | 811 |
|
| 2 | could [vb infin] [adv] [noun] | 254 |
|
| 3 | [vb infin] [adv] [adv] [noun] | 190 |
|
| 4 | could [vb infin] [adv] [noun] | 96 |
|
| 5 | could [adv] [adv] [noun] | 8 |
|
