| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [noun prp] could [not/n't] [vb infin] | 1381 |
|
| 2 | [conj] [noun prp] could [vb infin] | 1073 |
|
| 3 | [conj] could [not/n't] [vb infin] | 880 |
|
| 4 | [conj] [noun prp] could [not/n't] | 386 |
|
